Umi Deck #772952 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

Final Contextual Deck Power: 50/100 (±7 · Confidence: Medium)

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

Legality

Main 55 / Extra 15 / Side 0 — status: Legal.

Identity & game plan

• Win condition: Large Link and Synchro/Xyz boss monsters (Azure Ocean Dragon Lord - Neo-Daedalus Rage, Levia-Dragoon - Daedalus, Lancea, TY-PHON, AA-ZEUS) reached through Atlantis/Umi/Daedalus starters and tech-supported board control; Recursion of Atlantis monsters from the GY via Warchief, Siren Vortex, Levia-Dragon - Daedalus and Neo-Daedalus Rage
• Turn 1 (going first): Open a starter such as Advent of Atlantis, Fish Sonar, Warchief or Mulcharmy Fuwalos, reach Atlantis, City of the Sea Dragon or Umi on the field, then build a Link or Synchro boss while holding Ash Blossom or Droll & Lock Bird for protection
• Turn 2 (going second): Use ten hand traps (Ash Blossom, Ghost Ogre & Snow Rabbit, Artifact Lancea, Nibiru, Droll & Lock Bird, Electric Jellyfish) to stop the opponent's first summon, then rebuild through Mulcharmy draw effects and GY-revival Atlantis monsters
• Recovery: Mulcharmy Fuwalos and Purulia draw cards while the hand is small, Fisherman of Legend and Warchief recover from the GY, and Advent of Atlantis or Fish Sonar refills the starter count
• After siding: No side deck is registered, so there is no post-side plan; the deck has no sideboard adjustments to make between games

Why it scores here

The deck opens a functional plan reliably: the Atlantis/Umi core has 22 copies and P(at least one core card in a 5-card opening hand) is about 0.93, and P(at least one searcher) is about 0.92. Conversion is the weaker part, since no recorded boards exist and the ceiling reads only from card text, which is why D3 and D4 stay near the middle. Interaction is the strongest area: Raigeki, Harpie's Feather Duster, Solemn Judgment, Droll & Lock Bird, Ash Blossom, Ghost Ogre and Daedalus Maelstrom give broad coverage, and going second about 0.72 of hands contain a hand trap. The score is held down by a 55-card main deck with only 4 exact Umi-name copies (about 6% purity, 66 off-archetype copies), by Extra Deck slots spent on Mekk-Knight, Swordsoul, Brionac, Lancea and TY-PHON that do not connect to the engine, and by having no side deck. The score comes from consistency, interaction and boss output on the system, not from Umi being a popular archetype and not from averaging the individual card scores.

Dimension scores

How the score was computed

Strategy profile: Toolbox primary; Midrange weights not blended into the calculation. Structural ≈ 57, Going First ≈ 58, Going Second ≈ 66, Meta = provisional, Tournament Reliability ≈ 50. Modifiers: banlist exposure (-2); engine conflicts (-4). Final formula: 0.80*Structural + 0.20*TournamentReliability (Meta provisional); Structural 57.3, TR 50 → 55.9, then modifiers −6 → 49.9 → 50

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.93 · key two-card combo ≈ — · full-brick estimate ≈ 0.07 (all Inferred)
• Combo output: best PowerIndex —, median —, board-per-starter —
• Turn order: 0 going-first lines vs 0 going-second lines

Strengths

• Dense hand-trap and interaction package that stops the opponent's first summon going second
• Large boss monsters (2900–3300 ATK) convert board advantage into a win
• Good card economy through Mulcharmy draws, Fisherman and Warchief recursion

Weaknesses

• Only 4 exact-name Umi copies, so the engine is thin and mixed with 66 off-archetype copies
• Several Extra Deck slots do not connect to the Umi engine
• No side deck, so there is no post-side adjustment

Critical choke points

• Atlantis, City of the Sea Dragon (2 copies) and the Umi-name starters must land for most engine lines to start
• Relies on Ash Blossom and Droll & Lock Bird for protection against the opponent's first disruption

Recommended changes

Evidence & confidence

• Verified: Legal size (55 main, 15 extra, 0 side) and all Limited/Semi-Limited copy counts within limit; Card text for all 28 main and 13 extra distinct cards; Archetype core 22 copies; P(core in 5-card hand) ≈ 0.93
• Inferred: Consistency and brick estimates from hypergeometric draws; Interaction strength read from card text; Going-second hand-trap coverage (P ≈ 0.72); Dimension scores for D1–D11 and D14
• Provisional: Meta Power (null, no dated metagame sample); D13 matchup and format fit (50, no tournament link)
• Data gaps: no combos supplied — combo floor/median/ceiling is text-only inference no tournament link — archetype meta-share and per-pilot match record absent no side deck registered — post-side plan cannot be evaluated no win-rate telemetry exists in YGOVN — going-first/second, matchup and brick rates are Inferred or Unknown Meta Power is Provisional unless a dated metagame sample is supplied