Mermail Deck #770820 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

Final Contextual Deck Power: 35/100 (±6 · Confidence: Low)

• Primary strategy: Midrange
• Secondary strategies: Control
• Format: ocg

Legality

Main 55 / Extra 15 / Side 0 — status under the rules at evaluation time: Illegal. 2 violation(s).

Identity & game plan

• Win condition: Link and Xyz boss monsters (Poseidra Abyss, Worldsea Dragon Zealantis, Levia-Dragoon, Azure Ocean Dragon Lord) built from Atlantean, Mermail, Daedalus and Abyss-piece WATER monsters, with Atlantean Dragoons and Poseidra supplying direct attacks.; Mulcharmy card-draw engine and Moulinglacia / Levia-Dragon Umi plays in the Atlantis field-spell shell.
• Turn 1 (going first): Open with a Mermail or Atlantean searcher (Abyssteus, Abysspike, Neptabyss, Deep Sea Diva) into an Extra Deck link or Xyz summon while holding a hand trap (Ash Blossom, Ghost Belle, Ghost Ogre) for the opponent's response.
• Turn 2 (going second): Hold Ash Blossom, Ghost Belle, Ghost Ogre and Droll & Lock Bird as hand traps against the opponent's first summon or search, then convert a surviving Atlantean or Mermail body into a Link or Xyz boss.
• Recovery: Recover through Atlantis field-spell GY recursion (Warchief of Atlantis, Monster Arms of Atlantis, Call of Atlantis) and Mulcharmy draws, which refill the hand after a board is cleared.
• After siding: Not evaluable: the deck carries no side deck (side count 0), so there is no documented post-side plan.

Why it scores here

The deck reliably opens an Atlantean or Mermail starter: the archetype core group (26 copies) has an estimated 96.6% chance of at least one piece in a 5-card opening hand, and 15 searcher-text cards give about 81%. Its conversion ceiling is high because the 15-card Extra Deck carries 9 Link and 6 Xyz bosses that can be summoned from Atlantean and Daedalus material, and Poseidra and Levia-Dragoon add 2600 to 3000 ATK threats. The system leans on interaction: 10 hand traps and several floodgate or negation cards (Solemn Judgment, Skill Drain, Gameciel, Daedalus Maelstrom) give it a real answer to the opponent's first summon, with an estimated 72% chance of at least one hand trap in a going-second 6-card hand. It is held back by a 55-card Main Deck with only 31 distinct cards, a 4.3% exact-name Mermail purity, a missing side deck, and two over-limit Semi-Limited cards, so the deck is illegal and the score is a theoretical, structural-only read capped at 35. Popularity and archetype usage stats were not added to the score, and card scores were not averaged.

Dimension scores

How the score was computed

Strategy profile: Midrange. Structural ≈ 57, Going First ≈ 62, Going Second ≈ 66, Meta = provisional, Tournament Reliability ≈ 50. Modifiers: Illegal copy-limit cap (-12); No side deck (-4). Final formula: Illegal-list cap: theoretical/structural-only. Structural 57 and TR 50 give 0.80*57 + 0.20*50 = 55.6 before the cap; the deck is capped at 35 and the score is not a normal contextual score. Meta Power is null (provisional).

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.97 · 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

• Archetype core is very accessible (96.6% to open at least one piece with 26 copies).
• Extra Deck spread of 9 Link and 6 Xyz bosses gives many closing options.
• 10 hand traps and several negation cards give a strong going-second interaction package.

Weaknesses

• Illegal as built: two cards exceed their OCG copy limits.
• No side deck, so there is no post-side plan.
• Main deck is bloated at 55 cards with 31 distinct cards and low exact-name purity (4.3%).
• No combo or tournament evidence exists, so the median and meta reads are unsupported.

Critical choke points

• Engine starters are mostly WATER monsters that depend on the Atlantean and Mermail searcher chain.
• Mulcharmy needs an empty field to activate its draw effects, which conflicts with board-building lines.
• Moulinglacia needs exactly 5 WATER monsters in the GY, which is a conditional summon requirement.

Recommended changes

Evidence & confidence

• Verified: Legality: 55 Main, 15 Extra, 0 Side; Ash Blossom and Dominus Impulse exceed OCG copy limits.; Hypergeometric opening-hand probabilities from the resolved list.
• Observed: Archetype usage statistics: core cards at 100% (Abysstrite) and 90% (Marincess Coral Anemone) inclusion; this deck runs 0 copies of Abysstrite.
• Inferred: Consistency and brick estimates from text plus hypergeometric odds.; Interaction density from negation and removal card text.
• Provisional: Meta Power and D13 matchup fit, which need a dated metagame sample.
• 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 absent no win-rate telemetry exists in YGOVN Meta Power is Provisional unless a dated metagame sample is supplied no side deck was supplied, so D12 cannot be measured