Umi Deck #772168 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

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

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

Legality

Main 56 / Extra 15 / Side 0 — status under the rules at evaluation time: Illegal. 1 violation(s).

Identity & game plan

• Win condition: Umi / Atlantis field-driven board of Atlantean, Mermail and Daedalus monsters that converts into large Link and Xyz boards (Poseidra Abyss 3000 ATK, Azure Ocean Dragon Lord 2900 ATK, Brionac 2300 ATK) (Inferred from card text); Stealth Kragen and Toadally Awesome/Number-style Xyz boards that remove or negate the opponent's monsters (Inferred from card text)
• Turn 1 (going first): Open a WATER starter (Mulcharmy Purulia, First Penguin, Atlantean Dragoons) and search Atlantis, City of the Sea Dragon or a Daedalus/Atlantean enabler to make Umi live, then extend into a Link or Xyz with a Level 7 WATER base (Inferred)
• Turn 2 (going second): Hold Ash Blossom, Maxx C, Droll & Lock Bird, Infinite Impermanence or Ghost Ogre as hand traps against the opponent's first summon or search, then rebuild Umi from the Deck (Inferred)
• Recovery: Recycle the GY through Mulcharmy draw effects, Warchief and Levia-Dragoon revival effects, and Advent of Atlantis searches (Inferred from text)
• After siding: Not assessable: the list runs no Side Deck, so no post-side plan exists in the evidence (Provisional)

Why it scores here

This list is Illegal because Bahamut Shark is Forbidden in OCG and is run once, so the score is a structural-only read capped low and is not a normal Final Contextual score. The structural read comes from the system: the 17-copy archetype core gives about an 85 percent chance of at least one core card in a 5-card opening hand (Inferred), and Umi/Atlantis enablers, searchers and 10 hand traps give the deck a real interaction layer. Offensive closing power is credible because several Level 7 WATER Link and Xyz bosses reach 2800 to 3000 ATK. The score is held down by the low exact-archetype purity (4.2 percent, with 68 off-archetype copies across Mulcharmy, PSY-Frame, Daedalus and Atlantean sub-archetypes), by the absence of any combo evidence, by the absence of a Side Deck, and by the 56-card main with many single-copy pieces. Popularity and usage statistics were not used to add points, and card scores were not averaged into the deck score.

Dimension scores

How the score was computed

Strategy profile: Midrange. Structural ≈ 52, Going First ≈ 50, Going Second ≈ 56, Meta = provisional, Tournament Reliability ≈ 45. Modifiers: Illegal list: Forbidden card in deck (-20); Off-archetype engine spread (-1). Final formula: 0.80*Structural + 0.20*TournamentReliability + ContextModifiers, Meta provisional; Illegal cap applied via modifiers (0.80*52.15 + 0.20*45 = 50.7, minus 21 = 29.7, rounded to 30)

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

• Core archetype engine is reliably accessible in opening hands (about 85 percent for at least one core card)
• Ten hand traps and about 21 negation-text cards give going-second and mid-turn interaction
• Strong Link and Xyz closers (Poseidra Abyss 3000 ATK, Azure Ocean Dragon Lord 2900 ATK) with multiple recursion routes

Weaknesses

• Illegal list: Bahamut Shark is Forbidden and run once
• Low exact-archetype purity (4.2 percent) splits the engine across Mulcharmy, PSY-Frame, Daedalus and Atlantean sub-archetypes
• No Side Deck (0 of 15 slots), so there is no post-side plan
• No combo evidence, so the conversion and median output are unmeasured

Critical choke points

• Bahamut Shark (Forbidden) must leave the list before the deck can be played in OCG at all
• Umi must be on the field for many Umi-dependent effects to work, so a single Atlantis field or Umi enabler is a choke point

Recommended changes

Evidence & confidence

• Verified: Legality: Illegal, Bahamut Shark Forbidden with 1 copy run; main 56 and extra 15 are in size range; Exact archetype purity 4.2 percent; 68 of 71 copies are off-archetype; Usage stats: 10 of 16 core cards present; Hypergeometric probabilities: core-group P(>=1 in hand5) = 0.8493; hand-trap P(>=1 in hand6) = 0.7115
• Inferred: Engine accessibility is high from the 17-copy core, but conversion is unmeasured; Brick risk is elevated by 3-copy dead-on-arrival pieces; Interaction density (10 hand traps, 21 negation texts) gives a credible going-second plan; Mid-game recovery is supported by Mulcharmy draw and Warchief/Levia-Dragoon revival
• Provisional: Meta power and matchup fit: no tournament link, no dated meta sample; Going-first versus going-second split: no win-rate telemetry
• Data gaps: no combos supplied, so combo floor, median and ceiling are text-only inference no tournament link: archetype meta-share and per-pilot record are absent no win-rate telemetry (going-first/second, matchup, brick/starter rates) Meta Power is Provisional unless a dated metagame sample is supplied no Side Deck, so no post-side evidence