Umi Deck #767101 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

Final Contextual Deck Power: 40/100 (±10 · Confidence: Low)

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

Legality

Main 40 / Extra 15 / Side 0 — status: Illegal. 1 violation(s).

Identity & game plan

• Win condition: Umi / Atlantis board that Link and Xyz Summons into large attackers (Azure Ocean Dragon Lord - Neo-Daedalus Rage, Levia-Dragoon - Daedalus, Warchief and Levia-Dragon Daedalus) once the Atlantis field and Umi-named monsters are established; Recursive Atlantis GY loops (Warchief, Monster Arms, Levia-Dragon, Neo-Daedalus Rage) that re-summon Atlantis monsters and grind the opponent's board
• Turn 1 (going first): Opening First Penguin or Siren Vortex, search Atlantis, City of the Sea Dragon or Advent of Atlantis with Call of Atlantis, then Link or Xyz into Umi-named boss monsters
• Turn 2 (going second): Use hand traps (Ash Blossom, Droll & Lock Bird, Maxx C, Infinite Impermanence) to slow the opponent, then convert the resulting board into Umi Link or Xyz boss monsters
• Recovery: Recover via Advent of Atlantis, Warchief and Levia-Dragon GY effects and Fish Sonar searches for Umi-named monsters
• After siding: No side deck is listed, so no post-side plan can be evaluated; the Umi list has no defined sideboarding package

Why it scores here

This OCG Umi list is scored as a structural, theoretical read only, because it is Illegal: it runs 2 copies of Bahamut Shark, which is Forbidden in OCG, and that caps the normal contextual score. Within that limit the deck reliably opens an Atlantis or Umi starter: the core archetype group has an estimated 96.9% chance of at least one card in a 5-card opening hand, and the 16 searcher-text cards give an estimated 93.5% chance of a search. Hand traps (7 copies) give roughly 71% odds of at least one going second, which supports interruption and going-second interaction, but off-archetype copies (53 of 55 non-exact cards) and 3-copy cards with weak bodies such as Spike Seadra and Ice Barrier create brick and conflict risk. No recorded boards, no side deck and no tournament data exist, so the combo ceiling, median output and matchup fit are inferred from card text only. The score comes from consistency, interaction and system-level Umi conversion, not from averaging card scores or from the archetype's popularity.

Dimension scores

How the score was computed

Strategy profile: Midrange profile used for structural score; Balanced not applied. Structural ≈ 54, Going First ≈ 52, Going Second ≈ 58, Meta = provisional, Tournament Reliability ≈ 45. Modifiers: Banlist exposure (-12). Final formula: 0.80*Structural + 0.20*TournamentReliability + ContextModifiers (Meta provisional; Illegal, so theoretical/structural read only)

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.97 · 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

• Very high probability of finding an Umi or Atlantis starter in the opening hand
• Strong going-second interaction via 7 hand traps and multiple negation effects
• Large Umi-named Link and Xyz bosses with recursion text, giving route redundancy after one interruption

Weaknesses

• Illegal as built: 2 copies of Forbidden Bahamut Shark
• Low exact archetype purity (3.6%) with 53 off-archetype copies, which fragments the engine
• No side deck, so no post-side adaptability
• No recorded combo data, so ceiling and median are unmeasured

Critical choke points

• Atlantis, City of the Sea Dragon is a single copy, so losing it weakens the field-based engine
• Opening starter depends on a few 2–3-copy monsters that are not all Umi-named

Recommended changes

Evidence & confidence

• Verified: Bahamut Shark is Forbidden in OCG and is run 2 times in the Extra Deck; Main count 40 and Extra count 15 are within the OCG size rules; Archetype core P(≥1 in hand 5) ≈ 0.9691 from the hypergeometric evidence
• Inferred: Starter access is high from the probability table; Going-second interaction is supported by hand-trap density; Brick risk is elevated by off-archetype copies and weak filler; Combo ceiling and median are estimated from text only
• Provisional: Meta Power is null without a dated metagame sample; Matchup fit and tournament reliability are provisional
• 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 match record are absent No win-rate telemetry exists for this deck No side deck is supplied, so the post-side plan is absent Meta Power is provisional unless a dated metagame sample is supplied