Mermail Deck #767856 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

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

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

Legality

Main 59 / Extra 15 / Side 0 — status under the rules at evaluation time: Illegal. 2 violation(s).

Identity & game plan

• Win condition: Atlantis / Umi field-driven board of Water Link and Xyz monsters (Levia-Dragon, Poseidra, Mermail Abyssgaios) that pressures through disruption and search density; Atlantean Dragoons direct attack and Abyss- Xyz boards from Mermail Shadow Squad and Atlantean summons
• Turn 1 (going first): Open a searcher (Neptabyss, Abyssrhine, Mermail Abysspike) to add a Water engine piece, use Atlantis / Umi placement or Mulcharmy draws, and hold Ash Blossom or Droll for the first activation
• Turn 2 (going second): Use the six-card hand's hand traps (Ash Blossom, Evenly Matched, Droll & Lock Bird) and Solemn negations to stop the opponent's first board, then rebuild through Mermail or Atlantean searchers
• Recovery: Recover through GY-triggered summons (Mermail Abysspike, Atlantean Heavy Infantry, Warchief of Atlantis) and searchers that rebuild the Water engine after a single broken board
• After siding: Not assessable: Side Deck size is 0, so no post-side plan exists in the evidence

Why it scores here

The deck reliably opens a searcher in about 85% of opening hands, and the Mermail/Atlantean core (27 copies) is present in about 96% of openings, so the engine is reachable on turn 1 (Inferred from hypergeometric estimates). Its interaction density is high, with 15 negation and 20 removal text hits across hand traps and Solemn negations, which earns the end-board interaction score. The deck is a Toolbox-style blend of three sub-archetypes (only 4.1% exact-name purity, 71 off-archetype copies), so its combo ceiling and floor are scored from structure and text alone, with no recorded boards to measure. Popularity of the Mermail archetype did not earn points, and the card scores were not averaged. The deck is Illegal (Ash Blossom and Dominus Impulse at 3 copies against a limit of 2), and it has no side deck, so the final score is capped at 30 and labeled structural-only.

Dimension scores

How the score was computed

Strategy profile: Toolbox. Structural ≈ 53, Going First ≈ 50, Going Second ≈ 45, Meta = provisional, Tournament Reliability ≈ 40. Modifiers: banlist exposure (-6); no Side Deck (-4). Final formula: Illegal cap: 0.80*53 + 0.20*40 = 50.4 before cap; capped to 30 (structural-only, Meta provisional)

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.85 · 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

• Dense search and engine access: 18 searcher-text cards, with ~85% of openings reaching one
• Layered interaction: 6 hand traps plus Solemn negations and a removal suite
• Multiple boss threats in the Extra Deck, including Poseidra, Levia-Dragon and Mermail Abyssgaios

Weaknesses

• Illegal as built: Ash Blossom and Dominus Impulse exceed their copy limit by one each
• Low archetype purity (4.1%): three sub-archetypes compete for slots
• No side deck, so no best-of-3 adaptation
• No combo data, so the ceiling and median cannot be verified

Critical choke points

• Legality must be fixed before any normal score applies
• Engine depends on Atlantis / Umi placement and specific Water monsters in GY for summons

Recommended changes

Evidence & confidence

• Verified: Legality: 59 main, 15 extra, 0 side; Ash Blossom and Dominus Impulse are each over the limit; Banlist: Droll & Lock Bird, Instant Fusion, One for One and Solemn Judgment are Limited; Ash Blossom, Dominus Impulse and Solemn Warning are Semi-Limited; Composition: 15 negation text cards, 20 removal text cards, 18 searcher text cards; Exact-name archetype purity 4.1%; 71 off-archetype copies
• Inferred: Searcher reaches the opening hand ~85% of the time; Hand-trap coverage and Solemn negations give strong interaction density; Toolbox strategy classification from composition and text
• Provisional: Meta Power and matchup fit need a dated metagame sample; Archetype meta-share is unavailable
• Data gaps: No combos supplied: combo floor, median and ceiling are text-only inference No tournament link: archetype meta-share and per-pilot record absent No side deck: post-side and best-of-3 plans cannot be assessed No win-rate telemetry exists in YGOVN; going-first/second splits are Inferred Meta Power is Provisional unless a dated metagame sample is supplied