Umi Deck #771566 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

Final Contextual Deck Power: 30/100 (±10 · Confidence: Low)

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

Legality

Main 55 / Extra 15 / Side 0 — status under the rules at evaluation time: Illegal. 2 violation(s).

Identity & game plan

• Win condition: Umi-field Link/Synchro/Xyz boss monsters (Levia-Dragoon and Neo-Daedalus Rage, Chengying, Kragen, Ocean Dragon Lord) backed by Atlantis/Umi field-spell and monster-level-reduction support; Direct and piercing pressure from WATER monsters while Umi is on the field (Mega Fortress Whale, Warchief of Atlantis)
• Turn 1 (going first): Open with Fish Sonar, Advent of Atlantis or Atlantis, City of the Sea Dragon to set up the Umi field, then search Levia-Dragon Daedalus or Warchief for the Link/Synchro line (Inferred: lines are plausible but unverified without combo data)
• Turn 2 (going second): Hold Ash Blossom, Infinite Impermanence, Nibiru, Electric Jellyfish or Ice Barrier as interaction against the opponent's starter, then rebuild through Warchief and Fish Sonar (Inferred)
• Recovery: Recursion through Monster Arms of Atlantis, Siren Vortex and Warchief GY effects into the Atlantis and Umi engine (Inferred from card text)
• After siding: Not evaluable: the deck has no side deck (0 cards), so no post-side adaptation exists

Why it scores here

The list is illegal (Ash Blossom & Joyous Spring runs 3 copies against a limit of 2), so it receives a structural-only score capped at 30 rather than a normal final score. Its consistency is moderate: the archetype core (Atlantis/Umi/Daedalus) has about an 83% chance of at least one card in a 5-card opening hand, but only 7 of the 16 core cards are present and exact-name purity is 10%, with 63 off-archetype copies. Interaction is the strongest area, with 10 hand traps, 17 negation-text cards and several board-wiping spells supporting the endboard. Output is unmeasured because there are no recorded boards, so ceiling and median are text-only inference. The score comes from consistency, interaction and the system's structure, not from averaging card scores or from the Umi archetype's popularity; the empty side deck and the 26-card distinct main limit the score further.

Dimension scores

How the score was computed

Strategy profile: Midrange. Structural ≈ 49, Going First ≈ 50, Going Second ≈ 45, Meta = provisional, Tournament Reliability ≈ 40. Modifiers: banlist exposure (-3). Final formula: No-meta formula 0.80*Structural + 0.20*TournamentReliability + modifiers = 0.80*49 + 0.20*40 - 3 = 44; Illegal-list cap applied, so final is set to 30 (structural-only, theoretical)

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.83 · key two-card combo ≈ — · full-brick estimate ≈ 0.17 (all Inferred)
• Combo output: best PowerIndex —, median —, board-per-starter —
• Turn order: 0 going-first lines vs 0 going-second lines

Strengths

• Layered interaction: 10 hand traps and 17 negation-text cards
• Strong Extra Deck bosses at 2600-3000 ATK
• Searcher density (20 cards) supports card flow

Weaknesses

• Illegal list: Ash Blossom over copy limit
• Only 7 of 16 archetype-core cards present; 10% exact-name purity
• No side deck

Critical choke points

• Umi-field enablers (Advent of Atlantis, Atlantis, City of the Sea Dragon, Fish Sonar) gate most Link/Synchro routes
• Single-card dependence on Levia-Dragon Daedalus and Warchief for the boss line

Recommended changes

Evidence & confidence

• Verified: Legality: Ash Blossom & Joyous Spring 3 copies, OCG legal limit 2 (Semi-Limited); Main 55, Extra 15, Side 0 counts; Archetype-core presence 7 of 16 cards; exact-name purity 10%; Hand-trap count 10 and negation-text count 17 from card text
• Inferred: Hypergeometric opening-hand probabilities (0.83 for archetype core, 0.17 full brick); Starter and interaction plan descriptions from card text; Dimension scores D1-D14 and structural 49
• Provisional: Meta power (no dated metagame sample); Matchup and format fit (D13)
• Data gaps: No combos supplied: combo floor, median and ceiling are text-only inference No tournament link: archetype meta-share and per-pilot record absent No win-rate telemetry for this deck Meta Power is Provisional without a dated metagame sample Deck list is Illegal, so final score is capped and structural-only