Mermail Deck #775301 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

Final Contextual Deck Power: 30/100 (±8 · Confidence: Low)

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

Legality

Main 60 / Extra 15 / Side 0 — status under the rules at evaluation time: Illegal. 2 violation(s).

Identity & game plan

• Win condition: Atlantean/Abyss-/Daedalus Extra Deck boss monsters (Poseidra Abyss, Abysstrite, Levia-Dragon - Daedalus, Moulinglacia, Coelacanth) converting the WATER-Synchro/Xyz/Link engine into 2600-2800 ATK pressure; Atlantean Dragoons direct attacks from Level 3 or lower Sea Serpent monsters
• Turn 1 (going first): Open a starter (Mermail Abyssteus, Abysspike, Neptabyss, Abyssrhine, First Penguin or Mulcharmy) and convert it into a Synchro, Xyz or Link boss, using Poseidra or Atlantis-field cards for follow-up
• Turn 2 (going second): Use the 11 hand-trap and negation cards (Ash Blossom, Evenly Matched, Infinite Impermanence, Ghost Ogre, Droll & Lock Bird, Dominus Impulse) to break the opponent's first turn, then rebuild through the Atlantean engine
• Recovery: Recover through Mermail Abyssteus and Abysspike searches, Deep Sea Minstrel and Virtue Stream recursion, and Warchief of Atlantis from the GY
• After siding: Not evaluable: side_count is 0, so there is no post-side plan

Why it scores here

This list is illegal as built: three copies each of Ash Blossom & Joyous Spring and Dominus Impulse exceed the OCG Semi-Limited limit of two, so the Final Contextual score is capped at 30 and the evaluation is theoretical and structural only. The Structural score of 56 comes from the system as a whole: a 22-card archetype core opens at least one copy in 5 cards about 91% of the time, and eleven hand-trap and negation cards give strong going-second interaction (about 72% to have one in a 6-card opening). Median output is weighed separately and is low (D4 45), because no recorded boards exist and the deck mixes Mermail, Atlantean, Abyss-, Daedalus, Penguin, Mulcharmy and Greed pieces that do not all feed one engine. Popularity did not earn points: the Mermail archetype stat and the 6.7% exact-name purity were used only to read the core, and no card scores were averaged into the deck score. The side deck is empty, so adaptability (D12) is scored at 15.

Dimension scores

How the score was computed

Strategy profile: Midrange. Structural ≈ 56, Going First ≈ 58, Going Second ≈ 62, Meta = provisional, Tournament Reliability ≈ 40. Modifiers: banlist_exposure (-6); engine_conflicts (-3). Final formula: Illegal: capped at 30 (theoretical/structural only). Uncapped: 0.80*Structural(56) + 0.20*TournamentReliability(40) + modifiers(-9) = 44, then capped to 30 because the list is illegal. Meta provisional.

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.91 · key two-card combo ≈ — · full-brick estimate ≈ 0.09 (all Inferred)
• Combo output: best PowerIndex —, median —, board-per-starter —
• Turn order: 0 going-first lines vs 0 going-second lines

Strengths

• Large archetype core gives a high chance of a starter in the opening hand
• Eleven hand traps and negation cards give strong going-second interaction
• Several 2800-ATK bosses and Extra Deck flexibility across Synchro, Xyz and Link

Weaknesses

• Illegal copy counts for Ash Blossom and Dominus Impulse
• Sub-archetype mix (Mermail, Atlantean, Penguin, Mulcharmy, Greed) lowers engine coherence and raises brick risk
• No Side Deck, so no post-side adaptability

Critical choke points

• Reliance on the WATER GY count and Synchro/Xyz summons from few starters
• Lines that depend on the Atlantis field or Umi naming for their full value

Recommended changes

Evidence & confidence

• Verified: Main 60, Extra 15, Side 0 are within the OCG size rules; Ash Blossom and Dominus Impulse each run 3 copies against a legal limit of 2; Droll & Lock Bird and One for One each run 1 copy at the Limited limit of 1; Composition, archetype spread and the 22-card core share from the evidence pack
• Inferred: Starter and core hypergeometric probabilities (0.91 core in hand of 5; 0.72 hand-trap in hand of 6); Interaction density and resilience estimates from card text flags; Going-first and going-second scores from the card system, not averaged card scores
• Provisional: Meta Power (no dated metagame sample); Matchup and format fit (D13 = 50)
• Data gaps: No combos supplied, so combo floor, median and ceiling are text-only inference No tournament link, so archetype meta-share and per-pilot records are absent No win-rate telemetry exists in YGOVN Meta Power is provisional without a dated metagame sample No side deck, so post-side performance cannot be evaluated