Subterror Deck Breakdown

LIGHT 11

During the Main Phase, if your opponent Normal or Special Summoned 5 or more monsters this turn (Quick Effect): You can Tribute as many face-up monsters on the field as possible, and if you do, Special Summon this card from your hand, then Special Summon 1 "Primal Being Token" (Rock/LIGHT/Level 11/ATK ?/DEF ?) to your opponent's field. (This Token's ATK/DEF become the combined original ATK/DEF of the Tributed monsters.) You can only use this effect of "Nibiru, the Primal Being" once per turn.

EARTH 1

When your opponent activates a card or effect (Quick Effect): You can send this card from your hand or field to the GY, then target 1 "Subterror" monster you control; negate the activation, then change the targeted monster to face-down Defense Position. You can target 1 face-up monster you control; change it to face-down Defense Position, and if you do, Special Summon 1 "Subterror" monster from your hand or GY, in face-up or face-down Defense Position. You can only use each effect of "Subterror Fiendess" once per turn.

EARTH 12

FLIP: You can change all other face-up monsters on the field to face-down Defense Position. You can only use this effect of "Subterror Behemoth Ultramafus" once per turn. When a face-up monster you control is flipped face-down, if you control no face-up monsters: You can Special Summon this card from your hand in Defense Position. Once per turn: You can change this card to face-down Defense Position.

EARTH 7

FLIP: You can target 1 monster your opponent controls; banish it. You can only use this effect of "Subterror Behemoth Umastryx" once per turn. When a face-up monster you control is flipped face-down, if you control no face-up monsters: You can Special Summon this card from your hand in Defense Position. Once per turn: You can change this card to face-down Defense Position.

EARTH 4

FLIP: You can add 1 "Subterror" card from your Deck to your hand, except "Subterror Guru". You can target 1 other face-up monster on the field; change that monster, also this card, to face-down Defense Position. This is a Quick Effect if you control another "Subterror" card. You can only use each effect of "Subterror Guru" once per turn.

EARTH 8

2 "Ancient Gear" monsters Unaffected by other cards' effects. During your Main Phase: You can inflict 1000 damage to your opponent. You can only use this effect of "Ancient Gear Howitzer" once per turn. If this card is destroyed by battle and sent to the Graveyard: You can Special Summon 1 "Ancient Gear" monster from your Deck, ignoring its Summoning conditions.

DARK 8

2 DARK Dragon monsters (Quick Effect): You can target 1 monster you control and 1 card your opponent controls; destroy them. You can banish this card from your GY, then target 1 DARK Link Monster in your GY; Special Summon it, but it cannot activate its effects this turn. You can only use each effect of "Borreload Furious Dragon" once per turn.

DARK 5

1 Warrior monster + 1 Level 5 or higher Dragon monster If you Fusion Summon a Level 7 Dragon Fusion Monster, you can also banish monsters from your GY as material. If this card is Fusion Summoned: You can target 1 Spell/Trap in your GY that mentions "Gaia the Dragon Champion"; add it to your hand. You can only use this effect of "Curse of Dragon, the Magical Knight Dragon" once per turn.

LIGHT 8

1 "Shaddoll" monster + 1 LIGHT monster Must first be Fusion Summoned. If this card is Special Summoned: You can send 1 "Shaddoll" card from your Deck to the GY. At the start of the Damage Step, if this card battles a Special Summoned monster: Destroy that monster. If this card is sent to the GY: You can target 1 "Shaddoll" Spell/Trap in your GY; add it to your hand.

LIGHT 4

1 Synchro Monster + 1 Xyz Monster Must be Special Summoned (from your Extra Deck) by sending the above cards you control to the GY. (You do not use "Polymerization".) Once per turn: You can Special Summon 1 Level 4 monster from your hand. If this card is sent to the GY: You can target 1 card on the field; destroy it. You can only Special Summon "Elder Entity N'tss(s)" once per turn.

WATER 4

2 monsters with the same Attribute but different Types Your opponent cannot target this card, or monsters on the field with the same Attribute as this card, with card effects. Once per turn (Quick Effect): You can declare 1 Attribute; this card becomes that Attribute until the end of this turn.

DARK 7

1 "Predaplant" monster + 1 DARK monster Once per turn: You can target 1 monster on the field with a Level less than or equal to this card's; banish it. When an attack is declared involving this card and an opponent's face-up monster: You can activate this effect; until the end of this turn, that opponent's monster loses 1000 ATK, and if it does, this card gains 1000 ATK. Once per turn, during the next Standby Phase after this card was sent to the Graveyard: You can add 1 "Polymerization" Spell Card or "Fusion" Spell Card from your Deck to your hand.

DARK 8

2 DARK monsters on the field, except Tokens If this card is Fusion Summoned: You can make this card gain ATK equal to 1 opponent's Special Summoned monster, until the end of this turn. Once per turn: You can target 1 Level 5 or higher monster your opponent controls; until the End Phase, this card's name becomes that monster's original name, and replace this effect with that monster's original effects. If this Fusion Summoned card is destroyed: You can destroy all your opponent's Special Summoned monsters.

Spell Normal

Excavate the top 3 cards of your Deck, add 1 of them to your hand, also, after that, shuffle the rest back into your Deck. You can only activate 1 "Pot of Duality" per turn. You cannot Special Summon during the turn you activate this card.

Spell Quick

Discard 1 card; Fusion Summon 1 Fusion Monster from your Extra Deck, using monsters from either field as Fusion Material. Neither player can activate cards or effects in response to this card's activation.

Spell Field

When this card is activated: You can add 1 "Subterror" monster from your Deck to your hand. Once per turn: You can change 1 face-down Defense Position "Subterror" monster you control to face-up Attack or Defense Position. Once per turn, when an opponent's monster declares an attack: You can change 1 face-down Defense Position "Subterror" monster you control to face-up Attack or Defense Position, then you can negate the attack. You can only activate 1 "The Hidden City" per turn.

Trap Normal

Activate 1 of these effects, also, after that, Set this card face-down instead of sending it to the GY. ● Change 1 Set "Subterror" monster on the field to face-up Attack or Defense Position. ● Change 1 face-up "Subterror" monster on the field to face-down Defense Position. ● ATK/DEF of 1 "Subterror" monster on the field become equal to its combined original ATK/DEF until the end of this turn. ● This turn, activated effects of "Subterror" cards cannot be negated.

LIGHT 11

During the Main Phase, if your opponent Normal or Special Summoned 5 or more monsters this turn (Quick Effect): You can Tribute as many face-up monsters on the field as possible, and if you do, Special Summon this card from your hand, then Special Summon 1 "Primal Being Token" (Rock/LIGHT/Level 11/ATK ?/DEF ?) to your opponent's field. (This Token's ATK/DEF become the combined original ATK/DEF of the Tributed monsters.) You can only use this effect of "Nibiru, the Primal Being" once per turn.

EARTH 1

When your opponent activates a card or effect (Quick Effect): You can send this card from your hand or field to the GY, then target 1 "Subterror" monster you control; negate the activation, then change the targeted monster to face-down Defense Position. You can target 1 face-up monster you control; change it to face-down Defense Position, and if you do, Special Summon 1 "Subterror" monster from your hand or GY, in face-up or face-down Defense Position. You can only use each effect of "Subterror Fiendess" once per turn.

EARTH 4

FLIP: You can add 1 "Subterror" card from your Deck to your hand, except "Subterror Guru". You can target 1 other face-up monster on the field; change that monster, also this card, to face-down Defense Position. This is a Quick Effect if you control another "Subterror" card. You can only use each effect of "Subterror Guru" once per turn.

EARTH 8

2 "Ancient Gear" monsters Unaffected by other cards' effects. During your Main Phase: You can inflict 1000 damage to your opponent. You can only use this effect of "Ancient Gear Howitzer" once per turn. If this card is destroyed by battle and sent to the Graveyard: You can Special Summon 1 "Ancient Gear" monster from your Deck, ignoring its Summoning conditions.

DARK 8

2 DARK Dragon monsters (Quick Effect): You can target 1 monster you control and 1 card your opponent controls; destroy them. You can banish this card from your GY, then target 1 DARK Link Monster in your GY; Special Summon it, but it cannot activate its effects this turn. You can only use each effect of "Borreload Furious Dragon" once per turn.

LIGHT 8

1 "Shaddoll" monster + 1 LIGHT monster Must first be Fusion Summoned. If this card is Special Summoned: You can send 1 "Shaddoll" card from your Deck to the GY. At the start of the Damage Step, if this card battles a Special Summoned monster: Destroy that monster. If this card is sent to the GY: You can target 1 "Shaddoll" Spell/Trap in your GY; add it to your hand.

DARK 7

1 "Predaplant" monster + 1 DARK monster Once per turn: You can target 1 monster on the field with a Level less than or equal to this card's; banish it. When an attack is declared involving this card and an opponent's face-up monster: You can activate this effect; until the end of this turn, that opponent's monster loses 1000 ATK, and if it does, this card gains 1000 ATK. Once per turn, during the next Standby Phase after this card was sent to the Graveyard: You can add 1 "Polymerization" Spell Card or "Fusion" Spell Card from your Deck to your hand.

DARK 8

2 DARK monsters on the field, except Tokens If this card is Fusion Summoned: You can make this card gain ATK equal to 1 opponent's Special Summoned monster, until the end of this turn. Once per turn: You can target 1 Level 5 or higher monster your opponent controls; until the End Phase, this card's name becomes that monster's original name, and replace this effect with that monster's original effects. If this Fusion Summoned card is destroyed: You can destroy all your opponent's Special Summoned monsters.

Spell Normal

Excavate the top 3 cards of your Deck, add 1 of them to your hand, also, after that, shuffle the rest back into your Deck. You can only activate 1 "Pot of Duality" per turn. You cannot Special Summon during the turn you activate this card.

Spell Quick

Discard 1 card; Fusion Summon 1 Fusion Monster from your Extra Deck, using monsters from either field as Fusion Material. Neither player can activate cards or effects in response to this card's activation.

Spell Field

When this card is activated: You can add 1 "Subterror" monster from your Deck to your hand. Once per turn: You can change 1 face-down Defense Position "Subterror" monster you control to face-up Attack or Defense Position. Once per turn, when an opponent's monster declares an attack: You can change 1 face-down Defense Position "Subterror" monster you control to face-up Attack or Defense Position, then you can negate the attack. You can only activate 1 "The Hidden City" per turn.