Mermail Deck #772167 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

Final Contextual Deck Power: 25/100 (±8 · Confidence: Medium)

• Primary strategy: Midrange
• Secondary strategies: Toolbox, Stun
• Format: ocg

Legality

Main 56 / Extra 15 / Side 0 — status under the rules at evaluation time: Illegal. 1 violation(s).

Identity & game plan

• Win condition: Xyz/Link boards from the Atlantean and Mermail engine, closing through Poseidra Abyss, Neo-Daedalus Rage and Poseidra (theoretical, the deck is illegal as built); Atlantis field and Umi sub-engine (Warchief, Siren Vortex, Levia-Dragon) that converts GY and hand resources into board presence
• Turn 1 (going first): Open on Atlantean or Mermail searchers (Neptabyss, Abysspike, Dragoons) and extend with Mulcharmy draw pressure, while holding Ash Blossom and Infinite Impermanence for the first disruption
• Turn 2 (going second): Use the six-card hand's hand traps (Ash Blossom, Droll & Lock Bird, Maxx C, Ghost Ogre, Infinite Impermanence) and Dominus Impulse to break the opponent's board, then rebuild through GY recursion and Extra Deck summons
• Recovery: Recur Atlantean and Sea Serpent monsters from the GY via Dragoons and Shadow Squad effects, and rebuild a board through Abysstrite or Levia-Dragoon
• After siding: Not available: the deck has no Side Deck, so there is no post-side plan

Why it scores here

The deck's power is read from its system, not from the strength of its cards: the 21 archetype-core copies give about a 91.5% chance of at least one in a 5-card opening hand, and the 19 searcher-text cards give about 89%, so the engine is usually reachable on turn 1 or 2. Interaction is the strongest part of the build, with 10 hand traps, about 21 negation-text cards and about 18 removal-text cards, which lets it contest an established opposing board on the second player's turn. The Extra Deck (2 Levia-Dragoon, Poseidra Abyss, Neo-Daedalus Rage, Abysstrite and others) gives a broad Link and Xyz closing set. The deck earns no points from Mermail or Atlantean popularity, and no card scores were averaged into the result. The score is capped low because the deck contains a Forbidden card (Bahamut Shark), so it is evaluated as theoretical or structural only, with no recorded combos or meta data to ground the floor and median.

Dimension scores

How the score was computed

Strategy profile: Midrange. Structural ≈ 56, Going First ≈ 55, Going Second ≈ 62, Meta = provisional, Tournament Reliability ≈ 45. Modifiers: banlist exposure (-8); no Side Deck (-4). Final formula: Illegal deck, theoretical cap applied: computed 0.80*56 + 0.20*45 = 53.8, plus modifiers (-12) = 41.8, capped at 25 because the deck contains a Forbidden card and is not legal as built

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.25 · key two-card combo ≈ — · full-brick estimate ≈ — (all Inferred)
• Combo output: best PowerIndex —, median —, board-per-starter —
• Turn order: 0 going-first lines vs 0 going-second lines

Strengths

• Core engine is reliably reachable: 0.915 chance of at least one archetype-core card in the opening hand
• Dense interaction: 10 hand traps plus broad negation and removal text
• Strong closing options in the Extra Deck (Poseidra Abyss 3000 ATK, Neo-Daedalus Rage 2900 ATK)
• Good going-second answer package

Weaknesses

• Illegal as built: Bahamut Shark is Forbidden in OCG
• No Side Deck, so no post-side adaptation
• High off-archetype density (70 copies) across several sub-archetypes
• No recorded combo or match data to verify the ceiling or median

Critical choke points

• The Forbidden Extra Deck card occupies a slot, so the list cannot be played legally
• Single-copy starters (Atlantean Dragoons, Monster Arms) have about a 25% chance of appearing in the opening hand
• Engine depends on several Atlantis, Umi and Daedalus cards that have low individual copy counts

Recommended changes

Evidence & confidence

• Verified: Main 56 and Extra 15 cards are within the OCG size rules (main 40 to 60, extra 0 to 15, side 0 to 15); Bahamut Shark is Forbidden (copies 1, legal 0), so the deck is Illegal; Ash Blossom, Dominus Impulse and the other Semi-Limited cards run at their legal limit (2 copies); Card stats and text in the evidence pack
• Observed: Usage statistics show the Atlantean and Mermail core cards in 50 to 100% of sampled decks
• Inferred: Opening-hand probabilities (hypergeometric) for the engine and the hand traps; Interaction density and going-second strength from card text; Consistency estimates for starters and bricks
• Provisional: Matchup fit and Meta Power (no dated meta sample); Side Deck adaptability (no Side Deck present)
• Data gaps: No combos supplied: combo floor, median and ceiling are text-only inference No tournament link; archetype meta-share and per-pilot match record are absent No win-rate telemetry (going-first, going-second, matchup or brick rates) Meta Power is provisional without a dated metagame sample Evidence conflict: usage statistics marks Abysstrite, the Atlantean Spirit (9453320) as in this deck false, but the cards list includes it as an Extra Deck card with 1 copy No Side Deck present, so Side Deck adaptability is unscored by data