Mermail Atlantean Deck #773934 — Yu-Gi-Oh! Master Duel

Deck — Deck Power Evaluation

Final Contextual Deck Power: 62/100 (±7 · Confidence: Medium)

• Primary strategy: Combo
• Secondary strategies: Stun, Toolbox
• Format: master-duel

Legality

Main 55 / Extra 15 / Side 0 — status: Legal.

Identity & game plan

• Win condition: Send WATER monsters to the GY to chain their GY effects, then close with Extra Deck boss monsters (Poseidra Abyss, Mermail Abyssgaios, Mermail King - Neptabyss, Coelacanth-line beats).; Direct attacks from Atlantean Dragoons and Mermail Abyssgaios negation/lock pressure once a board is established.
• Turn 1 (going first): Open a WATER starter (First Penguin, Neptabyss, Abyssteus, Abysspike or Purulia), search an Atlantean/Mermail piece, and convert GY discards into a boss while holding Impermanence or Ash for the opponent's first interaction.
• Turn 2 (going second): Hold 8 hand traps (Impermanence, Ash, Dominus Impulse, Maxx C, Droll & Lock Bird, Crossout Designator, Abyssgaios-line negation) to stop the opponent's first Special Summon or board, then rebuild through GY recursion.
• Recovery: Recover through GY-activated WATER effects (Shadow Squad, Dragoons, Heavy Infantry) and Small World/Mermail searchers to refill the hand after a hand-trap or board-break.
• After siding: Not applicable: Master Duel is single-game with no side deck (Side Deck size 0).

Why it scores here

The deck reliably opens a WATER starter: the core archetype group has about a 92% chance of at least one copy in a 5-card opening hand, and about 93% for searcher text, so the engine is usually live by turn 2 (Inferred from the hypergeometric estimates). Its strongest reads are interaction and resilience: eight hand traps, plus Maxx C, Droll & Lock Bird and Crossout Designator, give it layered answers to a first Special Summon, and GY-activated WATER effects let it rebuild after a disruption. Its ceiling and floor are not measurable here because there are no recorded boards, so combo output is text-only and Inferred. The score comes from consistency, interaction and recovery on the system, not from averaging the individual card scores, and not from Mermail Atlantean being a popular archetype; meta and matchup fit stay Provisional because there is no dated sample. Engine coherence is the main drag: the list mixes Atlantean, Mermail, Abyss-, Mulcharmy, Penguin, Ice Barrier and Dominus pieces, so only about 40% of copies are exact-archetype.

Dimension scores

How the score was computed

Strategy profile: Combo. Structural ≈ 64, Going First ≈ 66, Going Second ≈ 66, Meta = provisional, Tournament Reliability ≈ 60. Modifiers: engine conflicts (-3); hand-trap density (2). Final formula: 0.80*Structural + 0.20*TournamentReliability (Meta provisional)

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.92 · 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

• Starter density: 13 three-copy starters and about 92% opening-hand access to the core
• Layered interaction: eight hand traps plus Maxx C, Droll, Crossout and Abyssgaios negation
• GY recursion gives a second line after disruption
• Extra Deck gives multiple closing bosses across Synchro, Xyz and Link

Weaknesses

• Loose archetype mix: 0 exact-name copies and 70 off-archetype copies
• Hand-trap-heavy hands can be non-functional with no board
• Several discard costs make the deck resource-intensive
• No recorded combo boards, so the ceiling and median are text-only

Critical choke points

• A single hand-trap-only hand on the going-first turn-1 with no WATER starter
• Losing the GY-activated WATER effects to a graveyard-hate or banish interaction

Recommended changes

Evidence & confidence

• Verified: Legal in Master Duel: 55 main, 15 extra, 0 side; Limited and Semi-Limited copy limits respected; Card text and stats for all 43 distinct cards; Archetype core group of 21 copies in the deck and 92% open-at-least-one-in-5 estimate
• Observed: Guide page confirms the WATER GY-recursion intent (one guide)
• Inferred: Consistency and brick estimates from the hypergeometric draw table; Interaction density from role tags and negation/removal text; Going-first and going-second power components
• Provisional: Meta Power (null) and matchup fit; Side-deck adaptability (not applicable to Master Duel)
• Data gaps: No combos supplied: combo floor, median and ceiling are text-only Inferred estimates No tournament link: archetype meta-share and per-pilot record absent No win-rate telemetry exists in YGOVN; brick and starter rates are computed, not observed usage statistics in this deck flags appear to reflect main-deck membership only: 14 Extra-Deck cards that are present in the card list show in this deck false Meta Power is Provisional without a dated metagame sample