Mermail Deck #770715 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

Final Contextual Deck Power: 25/100 (±10 · Confidence: Low)

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

Legality

Main 51 / Extra 15 / Side 0 — status under the rules at evaluation time: Illegal. 2 violation(s).

Identity & game plan

• Win condition: Water Xyz/Synchro/Link boards (Poseidra Abyss, Abysstrite, Icejade Gymir Aegirine, Levia-Dragoon) that are reached through Atlantean and Umi searches and draw engines (Mulcharmy, Neptabyss).; Atlantis and Daedalus link/field plays once Atlantis, City of the Sea Dragon is live, with Advent of Atlantis and Monster Arms of Atlantis as follow-up.
• Turn 1 (going first): Open on Neptabyss, Warchief, Mulcharmy or Fish Sonar to search and Special Summon a WATER engine, then extend into a Level 7 Extra Deck boss while keeping Ash Blossom and Droll up.
• Turn 2 (going second): Hold Ash Blossom, Infinite Impermanence, Droll and Maxx C as interaction for the opponent's first summon or draw, then rebuild the WATER board through Mulcharmy and Poseidra.
• Recovery: Recover through Mulcharmy Purulia and Mulcharmy Fuwalos draw effects, Deep Sea Minstrel, and Atlantis-tagged graveyard recursion (Monster Arms, Siren Vortex, Levia-Dragon).
• After siding: No Side Deck is registered, so there is no post-side plan; the list cannot adjust after game one.

Why it scores here

The deck is scored as a system, not as an average of its card scores. It reliably opens an engine: the 16 searcher-text cards put at least one searcher in the opening five with probability about 0.86, and the archetype-core group (22 copies) gives about 0.95 odds of at least one piece in hand. Its interaction suite is dense (14 negation-text and 13 removal-text cards, 7 hand traps), which earns the end-board and going-second scores. Consistency and interaction are held back by the mixed Atlantis/Umi/Atlantean/PSY-Frame identity (exact Mermail purity is 0%), 6 non-engine tech slots, and the absence of any recorded combos, so the median and ceiling cannot be measured and are set near the middle. Popularity did not earn points: the archetype usage data only confirms the core cards are real, and the Bahamut Shark copies are Forbidden. The Illegal status caps the Final Contextual score, so this is a theoretical, structural-only read.

Dimension scores

How the score was computed

Strategy profile: Midrange. Structural ≈ 54, Going First ≈ 55, Going Second ≈ 60, Meta = provisional, Tournament Reliability ≈ 50. Modifiers: banlist_exposure (-6). Final formula: No reliable metagame: 0.80*54 + 0.20*50 = 53.2; banlist-exposure modifier -6 gives 47; Illegal legality cap sets the reported score to 25 (theoretical, structural-only)

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.27 · 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 negation and removal suite (14 negation-text, 13 removal-text) with 7 hand traps
• Strong searcher density (16 searcher-text cards) giving high access to the engine
• Several 2800-3000 ATK boss monsters across Xyz, Synchro and Link

Weaknesses

• Illegal in OCG: two Forbidden Bahamut Shark copies
• Mixed identity with 0% exact Mermail purity; the engines do not share one archetype
• No Side Deck, so no post-side adaptation
• No recorded combos, so floor, median and ceiling cannot be measured

Critical choke points

• Bahamut Shark (Forbidden) occupies Extra Deck slots and must be removed before the list is playable
• Neptabyss, Warchief and Mulcharmy are the only 3-copy starters; each is about 0.27 to open in a 5-card hand

Recommended changes

Evidence & confidence

• Verified: Illegal: Bahamut Shark 2 copies vs 0 legal (Forbidden); Main 51, Extra 15, Side 0 within OCG size rules; Hand-trap count 7, searcher-text 16, negation-text 14, removal-text 13; Hypergeometric draw odds from copy histogram
• Inferred: Starter access and brick estimates; Interaction quality and going-second read from card text; Pilot complexity from Xyz/Link sequencing
• Provisional: Meta and format fit (no dated sample); Going-first and going-second power
• Data gaps: No combos supplied: floor, median and ceiling are text-only No tournament link: archetype meta-share and per-pilot record absent No win-rate telemetry for OCG going-first/second, matchup or brick rate No Side Deck registered, so post-side performance is unknown Meta Power Provisional without a dated metagame sample