Mermail Deck #768080 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

Final Contextual Deck Power: 30/100 (±10 · Confidence: Low)

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

Legality

Main 55 / Extra 15 / Side 0 — status: Illegal. 2 violation(s).

Identity & game plan

• Win condition: Atlantean/Mermail board pressure: Poseidra, Abyssgaios, Abysstrite and Poseidra Abyss Xyz/Synchro pressure built from WATER-monster recursion and searchers (Inferred from card text; no recorded boards); Hand-trap-supported disruption that keeps the WATER engine online through the opponent's turn (Inferred)
• Turn 1 (going first): Open a WATER starter (Neptabyss, Abyssteus, Abysspike, Shadow Squad, Dragoons) that searches or summons the next Atlantean/Mermail piece and reaches a Xyz or Synchro boss (Inferred)
• Turn 2 (going second): Hold Ash Blossom, Infinite Impermanence, Evenly Matched, Ghost Belle or Dominus Impulse against the opponent's first summon chain, then convert the surviving WATER monsters into a Synchro or Xyz boss (Inferred)
• Recovery: Recover through Mermail/Atlantean searchers and the Graveyard WATER-monster summon effects, which return bodies to the field after a board is cleared (Inferred)
• After siding: No side deck is registered (0 cards), so there is no post-side plan; this is a weakness in its own right

Why it scores here

This list is Illegal: Ash Blossom & Joyous Spring and Dominus Impulse are each run three times against an OCG limit of two, so the deck is scored as theoretical/structural-only and capped at 30. Its starter access is good on paper: the archetype core (22 copies) has a 93% chance of at least one card in a 5-card opening hand, and the searcher text group reaches 83%. Interaction is the strongest part of the system, with 14 hand traps giving an 84% chance of at least one in a 6-card going-second hand, which earns D7 and D8. Consistency is held back by low exact-archetype purity (12.9%, with 61 of 70 main copies outside the exact Mermail name) and a 0-card Side Deck, so D2 and D12 are weak. The score comes from the connected system (starter redundancy, interaction density, and a strong Extra Deck boss suite), not from averaging card scores, and popularity from usage stats did not earn points on its own because no combo boards or tournament results were available.

Dimension scores

How the score was computed

Strategy profile: Midrange. Structural ≈ 56, Going First ≈ 52, Going Second ≈ 60, Meta = provisional, Tournament Reliability ≈ 50. Modifiers: Banlist exposure (-8); Off-archetype dilution (-4). Final formula: Illegal-deck cap: structural-only. 0.80*Structural(56) + 0.20*TournamentReliability(50) = 54.8, then modifiers -12 gives 42.8, capped to 30 for illegal copy limits; Meta Power provisional/null.

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.93 · 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

• Layered interaction: 14 hand traps plus 13 negation-text cards
• Redundant WATER starters with 93% archetype-core access in a 5-card hand
• Extra Deck covers Xyz, Synchro and Link bosses at 2800-3000 ATK

Weaknesses

• Illegal copy limits on Ash Blossom and Dominus Impulse (3 vs 2 each)
• 0-card Side Deck gives no post-side plan
• Low exact-archetype purity (12.9%) and 25 generic cards raise brick risk
• No recorded boards, so the combo floor and median cannot be measured

Critical choke points

• Summoning enablers in the Graveyard: the WATER-monster cost chain has no alternative route if the GY is emptied
• Dependence on Ash Blossom and Dominus Impulse as interaction; with 2 legal copies each, one fewer copy is possible at the same slot

Recommended changes

Evidence & confidence

• Verified: Illegal status: Ash Blossom & Joyous Spring 3 copies vs 2 legal; Dominus Impulse 3 vs 2 legal; Main 55 / Extra 15 / Side 0 within OCG size rules; Archetype core 93.2% P(>=1 in 5-card hand) from hypergeometric draw table; Exact-name archetype purity 12.9%
• Inferred: Starter and hand-trap consistency probabilities (hypergeometric, Main Deck only); Midrange primary strategy from hand-trap density and Extra Deck spread; Going-first and going-second plans and dimension scores D1-D11, D14
• Provisional: Meta Power (no dated metagame sample); D13 matchup and format fit (archetype usage only, no tournament link)
• 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 (going-first/second, matchup, brick/starter/OTK rates) Meta Power is Provisional unless a dated metagame sample is supplied No side deck registered (side_count 0): post-side behavior cannot be assessed