Mermail Deck #770105 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

Final Contextual Deck Power: 34/100 (±8 · Confidence: Low)

• Primary strategy: Combo
• Secondary strategies: Midrange, Tempo
• 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 and Mermail boss monsters (Poseidra, Abysstrite, Poseidra Abyss, Mermail Abyssgaios, Worldsea Dragon Zealantis) and Extra Deck Link/Xyz beats, reached by chaining GY-triggered searches and special summons.; Mulcharmy draw-lock and Atlantis field-based level and Umi effects that punish a board with a single large attacker.
• Turn 1 (going first): Opening starter (Neptabyss, Mermail Abyssteus, Deep Sea Minstrel, or Atlantean Dragoons) searches a second Atlantean or Mermail body, then pivots into a Link or Xyz boss. The deck has no evidence-backed T1 lines beyond this structural reading.
• Turn 2 (going second): Relies on Solemn Judgment, Droll and Lock Bird, Red Reboot, Ash Blossom, and Maxx C as hand interaction to slow the opponent, then rebuilds through GY effects. Going-second strength is inferred only; no board data exists.
• Recovery: Recursion comes from GY effects of Mermail and Atlantean monsters, plus Warchief and Abyssrhine searches. Heavy Storm and Harpie's Feather Duster can hit the deck's own Spell/Trap engine pieces, which weakens recovery.
• After siding: Not applicable: the deck has no Side Deck (side_count 0), so it has no post-side plan.

Why it scores here

This is a structural-only read because the list is Illegal: it runs one Forbidden card in the Main Deck (Barrier Statue of the Torrent) and one in the Extra Deck (Bahamut Shark), and it has no Side Deck. The engine is reasonably accessible, since the core Atlantean and Mermail searchers give about a 0.93 chance of at least one archetype-core card in a 5-card opening hand (Inferred). However, exact-name archetype purity is only 8%, with 69 of 75 Main and Extra copies outside the Mermail name, and the engine is spread across Atlantean, Mermail, Abyss-, Daedalus, Mulcharmy, and Greed. Heavy Storm and Harpie's Feather Duster can destroy the deck's own Atlantis field and Advent of Atlantis, which conflicts with the engine. No combo boards were recorded, so the combo floor, median, and ceiling are text-only inference and carry low confidence. Popularity and usage statistics confirm only that the archetype exists in real lists; they do not raise the score. Scores were not averaged from individual card scores.

Dimension scores

How the score was computed

Strategy profile: approximately 85 Combo and 15 Midrange (disclosed, not computed from an exact ratio). Structural ≈ 47, Going First ≈ 48, Going Second ≈ 40, Meta = provisional, Tournament Reliability ≈ 44. Modifiers: banlist_exposure (-9); engine_conflicts (-3). Final formula: 0.80*Structural + 0.20*TournamentReliability (Meta provisional) = 46.4, then context modifiers -12 for Illegal status: 34

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

• High archetype-core density (about 0.93 chance of a core card in a 5-card opening hand)
• Strong Extra Deck bosses across Xyz, Link, and Synchro
• Layered interaction: five hand traps plus Limited staples

Weaknesses

• Illegal list: two Forbidden cards, one in each deck
• Low exact-name archetype purity (8%) and a spread across several sub-archetypes
• No Side Deck and no post-side plan
• Self-conflict between mass-destruction Spells and the deck's own engine

Critical choke points

• Neptabyss, Mermail Abyssteus, and Deep Sea Minstrel as the T1 starters (3 copies each, about 0.23 each in a 5-card hand)
• Heavy Storm and Harpie's Feather Duster can destroy the deck's own engine S/T
• Forbidden Bahamut Shark and Barrier Statue leave gaps the list cannot run legally

Recommended changes

Evidence & confidence

• Verified: Legality status Illegal: Barrier Statue of the Torrent and Bahamut Shark are Forbidden in the OCG list; Main/Extra/Side counts 60/15/0 are within the OCG size rules; Exact-name archetype purity is 8% (6 of 75 Main and Extra copies); Archetype-core group P(>=1 in hand5) = 0.931 and searcher-text group = 0.908 (hypergeometric); Limited staples present: Solemn Judgment, Maxx C, Droll and Lock Bird, Red Reboot, Harpie's Feather Duster, Heavy Storm, Appointer of the Red Lotus
• Observed: Usage statistics: 35 stat rows; 14 of 25 core cards present (56%)
• Inferred: Opening-hand consistency and brick risk from copy histogram and level-0 spell count; Floor, median, and ceiling read from card text only; no boards recorded; Going-second hand-interaction value from card text; Engine conflict between mass-destruction Spells and the deck's own S/T
• Provisional: Meta Power and format fit (no tournament link, no dated meta sample); Post-side plan (no Side Deck)
• 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 exists in YGOVN; going-first and going-second splits and matchup outcomes are Unknown Side Deck empty; no post-side evidence Meta Power is Provisional unless a dated metagame sample is supplied