Mermail Deck #771053 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

Final Contextual Deck Power: 35/100 (±8 · Confidence: Low)

• Primary strategy: Combo
• Secondary strategies: Toolbox, Tempo
• Format: ocg

Legality

Main 56 / Extra 15 / Side 0 — status under the rules at evaluation time: Illegal. 3 violation(s).

Identity & game plan

• Win condition: Atlantis/Umi engine: Atlantis, City of the Sea Dragon and Call of Atlantis fetch Atlantean and Atlantis-mention monsters, which Link or Xyz into Daedalus, Abyss- and Mermail boards for pressure; Daedalus link beatdown (Azure Ocean Dragon Lord, Levia-Dragoon) and Poseidra Abyss/Mermail Abyssgaios Xyz boards
• Turn 1 (going first): Open with a Poseidra/Atlantean searcher or Call of Atlantis for the Atlantis engine, then Link or Xyz into a Daedalus board while holding hand traps (Ash Blossom, Ghost Ogre, Evenly Matched) for the opponent's first response
• Turn 2 (going second): Hold hand traps (Ash Blossom, Ghost Ogre, Dominus Impulse) to answer the opponent's board, then rebuild the Atlantis engine from the GY and Deck
• Recovery: Recycle Atlantean and Atlantis monsters from the GY through Warchief of Atlantis, Monster Arms and Abyssrhine, and rebuild Umi-based Link boards
• After siding: Not evaluable: the deck has no side deck (side count 0), so there is no post-side plan

Why it scores here

The Atlantis/Umi engine is coherent around a core of Atlantean and Atlantis-mention monsters, and Call of Atlantis, Advent of Atlantis and Atlantis, City of the Sea Dragon reliably reach it, which gives a real Combo conversion ceiling. Hand traps (Ash Blossom, Ghost Ogre, Evenly Matched, Dominus Impulse) and the Daedalus Link board give end-board interaction and some resilience after one disruption. The score is capped low because the list is illegal: three Semi-Limited cards are run at 3 copies against a limit of 2. Because there are no recorded boards, no tournament data and no side deck, floor, median and post-side claims rest on structural inference only. Popularity of the Mermail/Atlantis space and the 56-card main deck were not credited, and card scores were not averaged.

Dimension scores

How the score was computed

Strategy profile: Combo. Structural ≈ 56, Going First ≈ 55, Going Second ≈ 50, Meta = provisional, Tournament Reliability ≈ 48. Modifiers: banlist_exposure (-12); no_side_deck (-2). Final formula: No reliable metagame: 0.80*Structural(56) + 0.20*TournamentReliability(48) = 54.4, then ILLEGAL cap applied (three Semi-Limited copies over limit) -> theoretical/structural-only final 35

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.95 · 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

• Atlantis/Atlantean engine is coherent: searchers, Call of Atlantis and Advent reach the Umi board
• Strong Link/Xyz end board (Azure Ocean, Levia-Dragoon, Poseidra Abyss) with multiple routes in the 15-card Extra Deck
• Dense hand-trap and negation text (Ash Blossom, Ghost Ogre, Evenly Matched, Dominus Impulse)

Weaknesses

• Illegal copy counts on three Semi-Limited cards, so the list cannot be played as built
• No side deck (side count 0)
• Bloated 56-card main deck with 22 distinct names and many single-purpose tech cards
• High dependence on the Atlantis field and Umi for the engine

Critical choke points

• Atlantis, City of the Sea Dragon (1 copy) is the engine's main hub; losing it to a field-targeting or Spell/Trap removal line collapses the Umi plan
• Call of Atlantis and Advent of Atlantis are the only non-monster routes into the engine

Recommended changes

Evidence & confidence

• Verified: Legality: 56 main / 15 extra / 0 side; three cards at 3 copies over the Semi-Limited limit of 2; Card text and archetype mapping for every card in the list; Extra Deck breakdown: 6 Link, 4 Xyz, 3 Fusion, 2 Synchro
• Inferred: P(>=1 starter in 5) about 0.95 and P(>=1 searcher in 5) about 0.90 (hypergeometric); Engine conversion ceiling and interaction density from card text; Floor and median are structural estimates only (no boards recorded)
• Provisional: Meta Power is null; no dated metagame sample supplied; Matchup fit (D13) is unknown; no tournament link or archetype meta-share
• Data gaps: no combos supplied — combo floor/median/ceiling is text-only inference no tournament link — archetype meta-share and per-pilot match record absent no win-rate telemetry exists in YGOVN (going-first/second, matchup, game-level, brick/starter/OTK rates) — those signals are Inferred or Unknown Meta Power is Provisional unless a dated metagame sample is supplied no title on the deck (title null); evaluated by archetype and deck id