Airorca
ATK:
1400
DEF:
300
Once per turn: You can banish 1 Fish, Sea Serpent, or Aqua-Type monster from your hand, then target 1 face-up card your opponent controls; destroy that target, then banish this card until your next Standby Phase.
Alien Dog
ATK:
1500
DEF:
1000
When you Normal Summon an "Alien" monster, you can Special Summon this card from your hand. When you do, place 2 A-Counters on face-up monster(s) your opponent controls.
Alien Kid
ATK:
1600
DEF:
700
Place 1 A-Counter on all monsters Special Summoned to your opponent's side of the field. (If a monster with an A-Counter battles an "Alien" monster, it loses 300 ATK and DEF for each A-Counter during damage calculation only.)
Alien Overlord
ATK:
2200
DEF:
1600
You can remove 2 A-Counters from anywhere on the field to Special Summon this card from your hand. Once per turn, you can place 1 A-Counter on each face-up monster your opponent controls. (If a monster with an A-Counter battles an "Alien" monster, it loses 300 ATK and DEF for each A-Counter during damage calculation only.) You can only control 1 "Alien Overlord".
Aqua Spirit
ATK:
1600
DEF:
1200
This card cannot be Normal Summoned or Set. This card can only be Special Summoned by removing from play 1 WATER monster in your Graveyard. During each of your opponent's Standby Phases, you can change the battle position of 1 of your opponent's face-up Monster Cards. Once changed, the monster must remain in this position for the rest of the turn.
Blizzard Thunderbird
ATK:
1600
DEF:
1400
You can discard 1 card; Special Summon 2 WATER Winged Beast-Type monsters, 1 from your hand and 1 from your Graveyard, except "Blizzard Thunderbird", then return this card from the field to the hand. You can only use this effect of "Blizzard Thunderbird" once per turn.
Clear Effector
ATK:
0
DEF:
900
If this card is sent to the Graveyard as a Synchro Material: Draw 1 card. A Synchro Monster that used this card as a Synchro Material cannot be destroyed by card effects.
Crystron Prasiortle
ATK:
500
DEF:
2000
You can target 1 face-up card you control; you cannot Special Summon monsters from the Extra Deck for the rest of this turn, except Machine-Type Synchro Monsters, also, destroy that card, and if you do, Special Summon 1 "Crystron" Tuner from your Deck. You can banish this card from your Graveyard; Special Summon 1 "Crystron" monster from your hand. You can only use 1 "Crystron Prasiortle" effect per turn, and only once that turn.
Crystron Rosenix
ATK:
1800
DEF:
1000
You can target 1 face-up card you control; you cannot Special Summon monsters from the Extra Deck for the rest of this turn, except Machine-Type Synchro Monsters, also, destroy that card, and if you do, Special Summon 1 "Crystron" Tuner from your Deck. You can banish this card from your Graveyard; Special Summon 1 "Crystron Token" (Machine-Type/WATER/Level 1/ATK 0/DEF 0), but it cannot be Tributed. You can only use 1 "Crystron Rosenix" effect per turn, and only once that turn.
Crystron Smiger
ATK:
1000
DEF:
1800
You can target 1 face-up card you control; you cannot Special Summon monsters from the Extra Deck for the rest of this turn, except Machine-Type Synchro Monsters, also, destroy that card, and if you do, Special Summon 1 "Crystron" Tuner from your Deck. You can banish this card from your Graveyard; add 1 "Crystron" Spell/Trap Card from your Deck to your hand. You can only use 1 "Crystron Smiger" effect per turn, and only once that turn.
Crystron Sulfefnir
ATK:
2000
DEF:
1500
If this card is in your hand or Graveyard: You can discard 1 "Crystron" card, except "Crystron Sulfefnir"; Special Summon this card in Defense Position, then destroy 1 card you control. If this card on the field is destroyed by battle or card effect: You can Special Summon 1 "Crystron" monster from your Deck in Defense Position. You can only use each effect of "Crystron Sulfefnir" once per turn.
Cyber Dragon
ATK:
2100
DEF:
1600
If only your opponent controls a monster, you can Special Summon this card (from your hand).
D.D. Guide
ATK:
1400
DEF:
1000
When this card is Normal Summoned, give control of it to your opponent. During each player's End Phase, your opponent selects 1 card from the Graveyard of this card's controller and removes it from play.
Fishborg Doctor
ATK:
400
DEF:
400
If this card is in your Graveyard and all monsters you control are "Fishborg" monsters (min. 1): You can Special Summon this card, and if you do, banish it when it leaves the field. You can only use this effect of "Fishborg Doctor" once per turn. If you control a monster that is not a "Fishborg" monster, destroy this card.
Flip Flop Frog
ATK:
500
DEF:
200
Once per turn, you can flip this card into face-down Defense Position. When this card is flipped face-up, you can return monsters your opponent controls to their owners' hand up to the number of face-up "Frog" monsters you control, except "Frog the Jam".
Gem-Armadillo
ATK:
1700
DEF:
500
When this card is Normal Summoned: You can add 1 "Gem-Knight" monster from your Deck to your hand.
Guard Penguin
ATK:
0
DEF:
1200
When you take damage from a card effect (except during the Damage Step): You can Special Summon this card from your hand, and if you do, gain LP equal to the damage you took.
Hack Worm
ATK:
400
DEF:
0
If your opponent controls no monsters, you can Special Summon this card (from your hand).
Jack Wyvern
ATK:
1800
DEF:
0
You can banish this card and 1 face-up Machine monster you control, then target 1 DARK monster in your GY; Special Summon it. You can only use this effect of "Jack Wyvern" once per turn.
Junk Giant
ATK:
2000
DEF:
2400
If your opponent controls a Level 5 or higher monster, you can Special Summon this card (from your hand). A Synchro Summon using this card as a Material cannot be negated. If a player Synchro Summons using this card as a Material, the other player cannot activate cards or effects when that monster is Synchro Summoned.
Legendary Atlantean Tridon
ATK:
1600
DEF:
800
You can Tribute this card and 1 Sea Serpent-Type monster; Special Summon 1 "Poseidra, the Atlantean Dragon" from your hand or Deck, then all monsters your opponent currently controls lose 300 ATK.
Majestic Mech - Goryu
ATK:
2900
DEF:
1800
You can Tribute Summon (but not Set) this card with 1 Tribute. If Summoned this way, during the End Phase: Send it to the Graveyard. If this card attacks a Defense Position monster, inflict piercing battle damage to your opponent.
Majestic Mech - Ohka
ATK:
2400
DEF:
1400
You can Normal Summon this card without Tributing. If you do, during the End Phase: Send it to the Graveyard.
Mecha Sea Dragon Plesion
ATK:
2300
DEF:
1800
If you control a face-up Sea Serpent-Type monster, you can Normal Summon this card without Tributing. Once per turn: You can Tribute 1 WATER monster to target 1 face-up card your opponent controls; destroy that target.
Mermail Abyssdine
ATK:
1000
DEF:
200
When this card is added from your Deck or Graveyard to your hand by a card effect: You can Special Summon this card from your hand. You must control a "Mermail" monster to activate and to resolve this effect. When this card is Special Summoned by the effect of a "Mermail" monster: You can target 1 Level 3 or lower "Mermail" monster in your Graveyard; Special Summon that target. You can only use 1 "Mermail Abyssdine" effect per turn, and only once that turn.
Mermail Abyssgunde
ATK:
1400
DEF:
800
If this card is discarded to the Graveyard: You can target 1 "Mermail" monster in your Graveyard, except "Mermail Abyssgunde"; Special Summon that target. You can only use the effect of "Mermail Abyssgunde" once per turn.
Mermail Abysslinde
ATK:
1500
DEF:
1200
If this card on the field is destroyed and sent to the Graveyard: You can Special Summon 1 "Mermail" monster from your Deck, except "Mermail Abysslinde". You can only use the effect of "Mermail Abysslinde" once per turn.
Mermail Abyssmander
ATK:
100
DEF:
2000
You can banish this card from your Graveyard to activate 1 of these effects; ● Increase the Levels of all "Mermail" monsters you currently control by 1. ● Increase the Levels of all "Mermail" monsters you currently control by 2.
Mermail Abyssocea
ATK:
1100
DEF:
1900
You can target 1 "Mermail" monster you control; Special Summon any number of Level 4 or lower "Mermail" monsters from your Deck whose combined Levels are less than or equal to the Level of that monster, then send that monster to the Graveyard. You can only use the effect of "Mermail Abyssocea" once per turn.
Mermail Abyssteus
ATK:
1700
DEF:
2400
You can discard 1 other WATER monster to the GY; Special Summon this card from your hand. When Summoned this way: You can add 1 Level 4 or lower "Mermail" monster from your Deck to your hand. You can only use this effect of "Mermail Abyssteus" once per turn.
Mother Grizzly
ATK:
1400
DEF:
1000
When this card is destroyed by battle and sent to the Graveyard: You can Special Summon 1 WATER monster with 1500 or less ATK from your Deck, in face-up Attack Position.
Nightmare Penguin
ATK:
900
DEF:
1800
All face-up WATER monsters you control gain 200 ATK. When this card is flipped face-up: Target 1 card your opponent controls; return that target to the hand.
Nimble Angler
ATK:
600
DEF:
100
If this card is sent from the hand or Deck to the Graveyard: You can Special Summon up to 2 Level 3 or lower "Nimble" monsters from your Deck, except "Nimble Angler".
Nimble Manta
ATK:
800
DEF:
100
When this card is sent from the field to the Graveyard by a card effect: You can Special Summon any number of "Nimble Manta" from your Deck.
Nimble Sunfish
ATK:
1000
DEF:
100
When this card is destroyed by battle and sent to the Graveyard, send 1 Fish-Type monster from your Deck to the Graveyard. Then, you can Special Summon 1 "Nimble Sunfish" from your Deck.
Nopenguin
ATK:
1600
DEF:
100
During either player's turn, when an effect of a "Penguin" monster is activated: Special Summon this card from your Graveyard. You can only use this effect of "Nopenguin" once per turn. If a card would be returned from the field to the hand by the effect of a "Penguin" card, banish it instead.
Poseidra, the Atlantean Dragon
ATK:
2800
DEF:
1600
You can Tribute 3 Level 3 or lower WATER monsters; Special Summon this card from your hand or Graveyard. When you do: Return all Spell and Trap Cards on the field to the hand, and if you do, if 3 or more cards are returned to the hand by this effect, all monsters your opponent currently controls lose 300 ATK for each.
Prior of the Ice Barrier
ATK:
1000
DEF:
400
If you control a face-up "Ice Barrier" monster, you can Special Summon this card (from your hand). You cannot Special Summon any Level 5 or higher monsters the turn you use this effect. You can Tribute this card to target 1 "Ice Barrier" monster in your Graveyard, except "Prior of the Ice Barrier"; Special Summon that target.
Puny Penguin
ATK:
400
DEF:
200
When this card is sent from the field to the Graveyard after being flipped face-up: Target 1 "Penguin" monster in your Graveyard, except "Puny Penguin"; Special Summon that target in face-up Attack Position or face-down Defense Position.
Ronintoadin
ATK:
100
DEF:
2000
Cannot be used as a Synchro Material. This card's name becomes "Des Frog" while it is on the field. If this card is in your Graveyard: You can banish 1 "Frog" monster from your Graveyard; Special Summon this card.
Sage of Silence
ATK:
1400
DEF:
1000
If this card destroys an opponent's monster by battle, your opponent cannot activate Spell Cards during the next turn.
Shore Knight
ATK:
1400
DEF:
1200
Once per turn, if the battle position of this face-up card on the field is changed: Send 1 WATER monster from your Deck to the GY.
Spined Gillman
ATK:
1300
DEF:
0
All Fish, Sea Serpent, and Aqua-Type monsters you control gain 400 ATK.
The Great Emperor Penguin
ATK:
1800
DEF:
1500
You can Tribute this card; Special Summon up to 2 "Penguin" monsters from your Deck, except "The Great Emperor Penguin".
Tradetoad
ATK:
100
DEF:
2000
Once per turn, you can Tribute 1 Aqua-Type monster to select 1 "Frog" monster in your Graveyard, except "Frog the Jam". Special Summon that monster from your Graveyard.
Warlock of the Ice Barrier
ATK:
400
DEF:
1000
While you control another face-up "Ice Barrier" monster, both players must Set Spell Cards before activating them, and cannot activate them until their next turn.
White Moray
ATK:
600
DEF:
200
During the turn you Normal Summoned this card, it can attack your opponent directly. If this card is Special Summoned from the GY: You can treat it as a Tuner this turn.
White Stingray
ATK:
1400
DEF:
1000
You can Special Summon this card (from your hand) by discarding 1 WATER monster. You can only Special Summon "White Stingray" once per turn this way. If this card is Special Summoned from the GY: You can treat it as a Tuner this turn. You can only use this effect of "White Stingray" once per turn.
Amphibious Bugroth
ATK:
1850
DEF:
1300
"Ground Attacker Bugroth" + "Defender of the Sea"
Cyber Twin Dragon
ATK:
2800
DEF:
2100
"Cyber Dragon" + "Cyber Dragon" A Fusion Summon of this card can only be done with the above Fusion Materials. This card can make a second attack during each Battle Phase.
Gem-Knight Aquamarine
ATK:
1400
DEF:
2600
"Gem-Knight Sapphire" + 1 "Gem-Knight" monster Must first be Fusion Summoned with the above Fusion Material Monsters. If this card attacks, it is changed to Defense Position at the end of the Battle Phase. When this card is sent from the field to the Graveyard: Target 1 card your opponent controls; return that target to the hand.
Bolt Penguin
ATK:
1100
DEF:
800
With each arm forming an electric whip, this monster paralyzes its enemies with electric shocks.
Flying Penguin
ATK:
1200
DEF:
1000
A very rare penguin that takes to the air with ears shaped like wings.
Gem-Knight Sapphire
ATK:
0
DEF:
2100
His Sapphire power commands the waters to protect him from attack. His comrades trust in his silent protection.
Mystery Shell Dragon
ATK:
2000
DEF:
0
Mysterious living matter that suddenly appeared from a different dimension. Its attack paralyzes the target's nerves, and causes intense hallucinations.
Sentinel of the Seas
ATK:
1300
DEF:
1000
A merman warrior that relentlessly attacks those who pollute the seas with their presence.
Cosmic Fortress Gol'gar
ATK:
2600
DEF:
1800
"Alien Ammonite" + 1 or more non-Tuner "Alien" monsters Once per turn, you can select any number of face-up Spell or Trap Cards. Return those cards to their owners' hands, and distribute new A-Counters among monsters on the field equal to the number of cards returned. Once per turn, you can remove 2 A-Counters from anywhere on the field to destroy 1 card your opponent controls.
Crystron Ametrix
ATK:
2500
DEF:
1500
1 Tuner + 1 or more non-Tuner monsters If this card is Synchro Summoned: You can change all face-up Special Summoned monsters your opponent controls to Defense Position. If this Synchro Summoned card is destroyed by battle or card effect: You can target 1 "Crystron" monster in your Graveyard, except a Synchro Monster; Special Summon it.
Crystron Quariongandrax
ATK:
3000
DEF:
3000
2 or more Tuners + 1 non-Tuner monster If this card is Synchro Summoned: You can target monsters your opponent controls and/or in their Graveyard, up to the number of Synchro Materials used for the Synchro Summon of this card; banish them. If this Synchro Summoned card is destroyed by battle or card effect: You can target 1 banished monster, except this card; Special Summon it to your field.
Gungnir, Dragon of the Ice Barrier
ATK:
2500
DEF:
1700
1 Tuner + 1 or more non-Tuner WATER monsters Once per turn: You can discard up to 2 cards to the Graveyard to target the same number of cards your opponent controls; destroy them.
Samsara, Dragon of Rebirth
ATK:
100
DEF:
2600
1 Tuner + 1 or more non-Tuner monsters If this card is destroyed by battle and sent to the Graveyard, or if this card you control is sent to your Graveyard by an opponent's card effect: You can target 1 monster in either player's Graveyard, except "Samsara, Dragon of Rebirth"; Special Summon it. You can only use this effect of "Samsara, Dragon of Rebirth" once per turn.
White Aura Dolphin
ATK:
2400
DEF:
1000
1 Tuner + 1+ non-Tuner monsters Once per turn: You can target 1 face-up monster your opponent controls; its ATK becomes half its original ATK until the end of this turn. If this card you control is destroyed by an opponent's card (by battle or card effect) and sent to your GY: You can banish 1 other WATER monster from your GY; Special Summon this card, and if you do, it is treated as a Tuner.
Alien Ammonite
ATK:
500
DEF:
200
When this card is Normal Summoned, you can Special Summon 1 Level 4 or lower "Alien" monster from your Graveyard. Destroy it during the End Phase.
Crystron Citree
ATK:
500
DEF:
500
During your opponent's Main Phase or Battle Phase: You can target 1 non-Tuner monster in your Graveyard; Special Summon it, but it has its effects negated (if any), and if you do, immediately after this effect resolves, Synchro Summon 1 Machine-Type Synchro Monster using only that monster and this card (this is a Quick Effect). These Synchro Materials are banished instead of being sent to the Graveyard. You can only use this effect of "Crystron Citree" once per turn.
Crystron Quan
ATK:
500
DEF:
500
During your opponent's Main Phase or Battle Phase: You can Special Summon 1 non-Tuner monster from your hand, but it has its effects negated (if any), and if you do, immediately after this effect resolves, Synchro Summon 1 Machine-Type Synchro Monster using only that monster and this card (this is a Quick Effect). You can only use this effect of "Crystron Quan" once per turn.
Crystron Rion
ATK:
500
DEF:
500
During your opponent's Main Phase or Battle Phase: You can target 1 of your banished non-Tuner monsters; Special Summon it, but it has its effects negated (if any), and if you do, immediately after this effect resolves, Synchro Summon 1 Machine-Type Synchro Monster using only that monster and this card (this is a Quick Effect). These Synchro Materials are shuffled into the Deck instead of being sent to the Graveyard. You can only use this effect of "Crystron Rion" once per turn.
Deep Sea Diva
ATK:
200
DEF:
400
When this card is Normal Summoned: You can Special Summon 1 Level 3 or lower Sea Serpent monster from your Deck.
Fishborg Archer
ATK:
300
DEF:
300
If this card is in your Graveyard and you control no monsters during either of your Main Phases: You can discard 1 WATER monster; Special Summon this card from your Graveyard, but destroy all monsters you control at the beginning of this turn's Battle Phase, except for WATER monsters. You can only use the effect of "Fishborg Archer" once per turn.
Fishborg Launcher
ATK:
200
DEF:
100
If you have a monster(s) in your Graveyard other than "Fishborg Launcher", and all of them are WATER: You can Special Summon this card from your Graveyard. If you do, banish it when it leaves the field. This card cannot be used as a Synchro Material Monster, except for the Synchro Summon of a WATER monster. You can only use the effect of "Fishborg Launcher" once per turn.
Geomancer of the Ice Barrier
ATK:
800
DEF:
1200
Discard 1 card and declare 1 Attribute. This card cannot be selected as an attack target by monsters with that Attribute. This effect can only be used once while this card is face-up on the field.
Hyper Synchron
ATK:
1600
DEF:
800
If this card is sent to the Graveyard for the Synchro Summon of a Dragon-Type monster: That monster gains 800 ATK, also banish that face-up monster during the End Phase.
Lappis Dragon
ATK:
0
DEF:
2600
If this card is added from the Deck to your hand: You can reveal this card; Special Summon it. If this card is added from your GY to your hand by a card effect: You can reveal this card; Special Summon this card, but banish it when it leaves the field. You can only use 1 "Lappis Dragon" effect per turn, and only once that turn.
Mecha Phantom Beast O-Lion
ATK:
600
DEF:
1000
You can banish this card from your Graveyard; immediately after this effect resolves, Normal Summon 1 "Mecha Phantom Beast" monster from your hand. While you control a Token, this card cannot be destroyed by battle or card effects. If this card is sent to the Graveyard: You can Special Summon 1 "Mecha Phantom Beast Token" (Machine-Type/WIND/Level 3/ATK 0/DEF 0). You can only use this effect of "Mecha Phantom Beast O-Lion" once per turn.
Royal Swamp Eel
ATK:
1700
DEF:
1200
If this card is used as a Synchro Material Monster, all the other Synchro Material Monsters must be Fish-Type.
Abyss-scale of Cetus
Equip only to a "Mermail" monster. It gains 800 ATK. When a Trap effect that was activated on your opponent's side of the field resolves, negate that effect, then send this card to the Graveyard.
Abyss-scale of the Kraken
Equip only to a "Mermail" monster. It gains 400 ATK. When a monster effect that was activated on your opponent's side of the field resolves, negate that effect, then send this card to the Graveyard.
Call of the Atlanteans
Target 3 Level 3 or lower Sea Serpent-Type monsters in your Graveyard; Special Summon all 3 of them. You cannot Special Summon any other monsters during the turn you activate this card.
Code A Ancient Ruins
Each time a face-up "Alien" monster(s) is destroyed, place 1 A-Counter on this card. Once per turn, you can remove 2 A-Counters from anywhere on the field to Special Summon 1 "Alien" monster from your Graveyard.
Crystolic Potential
All "Crystron" monsters you control gain 300 ATK and DEF. Once per turn, during the End Phase: You can draw cards equal to the number of "Crystron" Synchro Monsters you Synchro Summoned this turn.
Night Beam
Target 1 Set Spell/Trap your opponent controls; destroy that target. Your opponent cannot activate the targeted card in response to this card's activation.
Whitefish Salvage
You can target 1 Fish monster in your GY; add it to your hand. You can only use this effect of "Whitefish Salvage" once per turn. If this card in your possession is destroyed by an opponent's card effect and sent to your GY: Take 1 Fish monster from your Deck, and either add it to your hand or Special Summon it.
Abyss-scorn
Target 1 "Mermail" monster you control; it gains 1000 ATK until the End Phase. When this Set card is sent to the Graveyard: Target 1 monster your opponent controls; send that target to the Graveyard.
Abyss-sphere
Special Summon 1 "Mermail" monster from your Deck. Its effects are negated. You cannot activate any Spell Cards. When this card leaves the field, destroy that monster. Destroy this card during your opponent's next End Phase after activation.
Crystron Entry
Special Summon 2 "Crystron" Tuners (1 from your hand and 1 from your Graveyard). During either player's turn, except the turn this card was sent to the Graveyard: You can banish this card from your Graveyard, then target 1 "Crystron" monster you control; send 1 "Crystron" monster from your Deck to the Graveyard whose Level is different from that monster, and if you do, that monster becomes the Level of that monster sent to the Graveyard. You can only use this effect of "Crystron Entry" once per turn.
Interdimensional Warp
Select a monster you control and a monster with an A-Counter(s) your opponent controls. Switch control of those monsters.
Oh F!sh!
When an Effect Monster's effect activates: Shuffle 1 of your banished Fish, Sea Serpent, or Aqua-Type monsters into the Main Deck; negate the activation and destroy it.
Reject Reborn
When an opponent's monster declares a direct attack: End the Battle Phase, then you can Special Summon 1 Tuner and 1 Synchro Monster from your Graveyard, but they have their effects negated.
Subsurface Stage Divers
If you control exactly 3 non-Token monsters with the same name, and no other monsters: You can add 3 monsters with the same name as each other from your Deck to your hand. For the rest of this turn after this card resolves, you cannot Normal Summon/Set or Special Summon monsters with the added monsters' name, nor activate their monster effects. You can only activate 1 "Subsurface Stage Divers" per turn.
Underworld Egg Clutch
When a face-up Fish, Sea Serpent, or Aqua-Type monster you control is banished: Add 1 Level 4 or lower Fish, Sea Serpent, or Aqua-Type monster from your Deck to your hand.