Umi Control Deck #455304 — Yu-Gi-Oh! Master Duel

Deck — Deck Power Evaluation

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

• Primary strategy: Control
• Secondary strategies: Stun, Toolbox
• Format: master-duel

Legality

Main 42 / Extra 15 / Side 0 — status under the rules at evaluation time: Illegal. 5 violation(s).

Identity & game plan

• Win condition: Board control via Umi and Kairyu-Shin lock followed by Extra Deck bosses (Fiendsmith Lacrima, Galaxy-Eyes Photon Lord, Snake-Eyes Doomed Dragon, TY-PHON); Fiendsmith Extra Deck pressure after the opponent's board is stripped
• Turn 1 (going first): Open with Fish Sonar or Kairyu-Shin to add Umi and Kairyu-Shin spells, establish Umi, and hold up Ash Blossom, Ghost Ogre and Effect Veiler as the lock pieces
• Turn 2 (going second): Use hand traps (Ash Blossom, Droll, Maxx, Effect Veiler, Ghost Ogre) to break the opponent's first turn, then convert with Fiendsmith or Umi boss monsters
• Recovery: Recover through Kuriphoton, Fiendsmith Engraver GY revival, Mulcharmy draw effects and the Fiendsmith Tract banish-to-fusion route
• After siding: No side deck is registered, so there is no post-side plan in the list

Why it scores here

The deck's Main Deck is built from searchers, hand traps and a Umi lock that can open a turn-one plan on a reasonable share of hands, with a 94% chance of at least one searcher in a five-card opening hand. Its interaction density is the main strength: several hand traps and negation cards can answer the opponent's first turn, which earns the going-second and interaction scores. The Extra Deck boss monsters give it closing power, but the list runs three or more engines (Umi, Fiendsmith, Millennium) with little shared support, which costs consistency and conversion. No recorded boards exist for this list, so the conversion scores are structural reads from card text rather than measured output. The deck is illegal in its current form: five entries exceed copy limits or are Forbidden, so the score is capped at 30 and treated as theoretical only. Popularity of the Umi Control archetype did not earn points, and the card scores were not averaged into the deck score.

Dimension scores

How the score was computed

Strategy profile: Control. Structural ≈ 51, Going First ≈ 48, Going Second ≈ 56, Meta = provisional, Tournament Reliability ≈ 40. Modifiers: banlist exposure (-8); engine conflicts (-4). Final formula: No reliable metagame: 0.80*Structural + 0.20*TournamentReliability = 49, then modifiers -12 = 37, then capped at 30 because the deck is Illegal (theoretical only)

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.94 · 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

• Dense interaction: several hand traps and negations can answer the opponent's first turn
• Strong closing bosses in the Extra Deck, several at 2500 to 3000 ATK
• Searcher density gives high access to at least one starter in the opening hand

Weaknesses

• Illegal list: five cards exceed copy limits or are Forbidden
• Three or more engines (Umi, Fiendsmith, Millennium) compete for the same Main Deck slots
• No Side Deck, so no best-of-3 adaptation
• Several narrow cards need specific board states (Ice Barrier, Nibiru, Fabled Lurrie)

Critical choke points

• Umi must be on the field for the Kairyu-Shin lock and the Umi-tagged interactions to work
• Fiendsmith Extra Deck summons need the LIGHT Fiend monster and Fiendsmith Tract in hand
• Ash Blossom and Effect Veiler are the main answers, so an early hand trap loss removes most of the first-turn protection

Recommended changes

Evidence & confidence

• Verified: Main Deck of 42 and Extra Deck of 15 are within the Master Duel size rules; Five copy-limit or Forbidden violations (Called by the Grave x2, Apollousa, Beatrice, Maxx C x2, Droll & Lock Bird x3); No Side Deck registered; Card text for the 39 distinct cards in the list
• Observed: No recorded boards exist for this deck
• Inferred: Opening-hand consistency estimates (about 0.94 for a searcher, about 0.32 for an engine starter); Interaction density read from card text (hand traps, negations, removal); Going-second strength from hand traps; Engine conflict across Umi, Fiendsmith and Millennium
• Provisional: Meta Power (no dated metagame sample); Format fit (no tournament link or archetype meta share)
• Data gaps: No combos supplied, so floor, median and ceiling are text-only inference No tournament link, so archetype meta-share and pilot match record are absent No win-rate telemetry, so going-first, going-second, matchup and brick rates are Inferred or Unknown Meta Power is provisional without a dated metagame sample No Side Deck registered, so the post-side plan cannot be evaluated