Umi Deck #770941 — Yu-Gi-Oh! OCG
55 Main, 15 Extra, incl. Abyss Shark x3, Mulcharmy Fuwalos x3, Ocean Dragon Lord - Kairyu-Shin x3. Created Oct 21, 2026 by YGO Mod.
Created by: YGO Mod (20517634)
Created On: 10/21/2026
Main Deck (55)
- Abyss Shark x3
- Buzzsaw Shark x2
- Drake Shark x1
- Electric Jellyfish x2
- First Penguin x2
- Mega Fortress Whale x1
- Mulcharmy Fuwalos x3
- Ocean Dragon Lord - Kairyu-Shin x3
- Superancient Deepsea King Coelacanth x1
- Surfacing Big Jaws x3
- Ash Blossom & Joyous Spring x3
- Fishborg Harpooner x1
- Ghost Ogre & Snow Rabbit x3
- A Legendary Ocean x2
- Fish Sonar x3
- Fury of Kairyu-Shin x1
- Harpie's Feather Duster x1
- Lightning Storm x1
- Pot of Prosperity x1
- Sea Stealth II x2
- Seventh Tachyon x3
- Super Polymerization x3
- Infinite Impermanence x3
- Kairyu-Shin's Dark Reef x1
- Sea Stealth Attack x1
- Solemn Judgment x1
- Solemn Warning x1
- Torrential Tribute x1
- Unbreakable Xyz Barrier x2
Extra Deck (15)
- Garura, Wings of Resonant Life x1
- Mudragon of the Swamp x1
- Eria the Water Charmer, Gentle x1
- Askaan, the Bicorned Ghoti x1
- White Aura Whale x1
- N.As.H. Knight x1
- Number 101: Silent Honor ARK x1
- Number 106: Giant Hand x1
- Number 32: Shark Drake x1
- Number 4: Stealth Kragen x1
- Number C101: Silent Honor DARK x1
- Number C32: Shark Drake LeVeiss x1
- Stealth Kragen Spawn x2
- Super Starslayer TY-PHON - Sky Crisis x1
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Deck — Deck Power Evaluation
Final Contextual Deck Power: 25/100 (±8 · Confidence: Low)
| Overall score | Value |
|---|---|
| Structural Deck Power | 46.2 |
| Going First | 52 |
| Going Second | 58 |
| Meta Power | provisional |
| Tournament Reliability | 42 |
- Primary strategy: Midrange
- Secondary strategies: Tempo, Toolbox
- Format: ocg
Legality
Main 55 / Extra 15 / Side 0 — status under the rules at evaluation time: Illegal. 3 violation(s).
Identity & game plan
- Win condition: Umi board of WATER monsters converting into Xyz/Synchro/Fusion boards (Number C32, Superancient Coelacanth, Mega Fortress Whale, White Aura Whale) with direct-attack support from Mega Fortress Whale under Umi; Recurring WATER Xyz pressure through Stealth Kragen and Number 101 ARK
- Turn 1 (going first): Open Fish Sonar, Surfacing Big Jaws or First Penguin to set up Umi and a WATER starter, then Special Summon through Kairyu-Shin or Abyss Shark into a Xyz or Synchro
- Turn 2 (going second): Hold Ash Blossom, Ghost Ogre and Infinite Impermanence to stop the opponent's first summon, then rebuild Umi-based pressure from the Extra Deck
- Recovery: Search Umi and WATER monsters via Fish Sonar, Kairyu-Shin and Fury of Kairyu-Shin, then rebuild through Kairyu-Shin's Dark Reef and Sea Stealth effects
- After siding: Not applicable: the deck runs no Side Deck (side_count 0), so no post-side plan exists
Why it scores here
The deck scores as a system, not as an average of its cards: its Umi shell reliably opens with a WATER starter, since the Fish Sonar and Big Jaws starter density gives a searcher hit in about 91% of opening hands (Inferred). Its interaction is dense, with 14 negation-text and 17 removal-text cards plus 9 hand traps, which keeps the Extra Deck pressure intact on the going-second turn. Conversion is limited: only 3 of 16 archetype-core cards are present, so the Umi build is largely generic (12.9% exact-name purity; 61 off-archetype copies across roughly 10 sub-archetypes), which costs engine coherence and adds brick risk. The list is Illegal under OCG copy limits (Seventh Tachyon at 3 copies vs 1, Ash Blossom and Super Polymerization at 3 vs 2), so it receives a capped score labelled theoretical/structural-only. Popularity and archetype usage did not earn points, and no recorded combos exist to anchor median or ceiling output.
Dimension scores
| # | Dimension | Score | Evidence |
|---|---|---|---|
| D1 | Engine Accessibility & Consistency | 52 | P(>=1 of a 3-copy starter in 5-card hand) = 0.25; searcher text group P(>=1) = 0.91 but no recorded combo support (Inferred) |
| D2 | Opening-Hand Quality & Brick Management | 40 | Dead or conditional cards such as Super Polymerization, Torrential Tribute and Solemn cards with 27 generic-named copies; brick estimate high (Inferred) |
| D3 | Combo Conversion & Ceiling | 45 | Ceiling from text only: Kairyu-Shin, Fury and Coelacanth into Xyz/Synchro boards; no recorded combos available (Inferred) |
| D4 | Combo Floor & Median Output | 40 | Median output unknown: combos_evidence has 0 parseable boards, so floor is text-only (Inferred) |
| D5 | Interruption Resilience & Route Redundancy | 50 | 9 hand traps and multiple negate/removal options give partial recovery; Extra Deck Xyz recursion is narrow (Inferred) |
| D6 | Resource Economy, Recovery & Grind | 47 | Searcher density and Fury/Fish Sonar recovery offset by Xyz material demands and single-use Umi resources (Inferred) |
| D7 | End-Board & Interaction Quality | 62 | 14 negation-text and 17 removal-text cards with 9 hand traps; layering is broad but copy-limit illegal (Inferred semantic read) |
| D8 | Going-Second & Board-Breaking Power | 55 | Going-second hand trap probability P(>=1 of 9 hand traps in 6 cards) = 0.68 with Ash and Ghost Ogre as disruption; no going-second split recorded (Inferred) |
| D9 | Offensive Pressure & Closing Power | 55 | Extra Deck bosses reach 2550-3100 ATK (Number C32, White Aura Whale, Coelacanth) and Mega Fortress Whale enables direct attacks under Umi (Verified stat / Inferred use) |
| D10 | Main Deck Efficiency & Flexibility | 35 | 55 main-deck cards with 17 tech and 27 generic-named slots and 61 off-archetype copies; low coherence (Inferred from composition) |
| D11 | Extra Deck Efficiency & Coverage | 40 | 15 Extra cards spanning Xyz, Synchro, Fusion and Link with no single engine; several Number and Stealth Kragen Xyz depend on different materials (Inferred) |
| D12 | Side Deck Adaptability | 10 | No Side Deck (side_count 0 against sideMax 15); no post-side plan exists (Verified) |
| D13 | Matchup Coverage & Format Fit | 40 | No tournament link or dated meta sample; archetype usage shows only 18.8% core presence (Provisional) |
| D14 | Pilotability & Error Tolerance | 45 | Multiple decision points: Umi-tied triggers, Xyz material choices, and several once-per-turn restrictions (Inferred) |
How the score was computed
Strategy profile: Midrange primary with a Toolbox secondary; weights used as the Midrange profile. Structural ≈ 46.2, Going First ≈ 52, Going Second ≈ 58, Meta = provisional, Tournament Reliability ≈ 42. Modifiers: banlist_exposure (-6); engine_conflicts (-3); no_side_deck (-3); illegal_list_cap (-8). Final formula: No reliable metagame: 0.80*Structural(46.2) + 0.20*TournamentReliability(42) = 45.4; modifiers -12 gives 33.4; Illegal list capped to 25 (theoretical/structural-only)
Probability & combo summary
- Opening a starter: P(≥1) ≈ 0.25 · 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 searcher density (20 searcher-text cards) gives a reliable early hit
- Broad interaction layer: 9 hand traps and 14 negation-text cards
- Extra Deck bosses reach 2550-3100 ATK with direct-attack support
Weaknesses
- Illegal under OCG copy limits: Seventh Tachyon, Ash Blossom and Super Polymerization over cap
- Low archetype-core presence (3 of 16 core cards)
- No Side Deck and no recorded combos to anchor median output
Critical choke points
- Umi must be on the field for most engine and interaction effects, so an early Umi removal or no-Umi opening stalls the plan
- Single Xyz material chain through Number and Stealth Kragen monsters
Recommended changes
| Priority | Remove | Add | Reason |
|---|---|---|---|
| 1 | 1 Seventh Tachyon | 1 Umi or WATER monster from the core list | Brings Seventh Tachyon to its single legal copy and removes the largest copy-limit violation |
| 2 | 1 Ash Blossom & Joyous Spring | 1 Solemn Warning or a non-restricted hand trap | Brings Ash Blossom to its 2-copy cap and keeps a hand-trap slot |
| 3 | 1 Super Polymerization | 1 Atlantis or Marincess core card | Brings Super Polymerization to its 2-copy cap and adds a core Umi-engine card |
Evidence & confidence
- Verified: Illegal status and three copy-limit violations (Seventh Tachyon, Ash Blossom, Super Polymerization); Main 55 and Extra 15 within size rules; side 0 with no Side Deck; Core presence 3 of 16 archetype-core cards (18.8%)
- Inferred: Starter and searcher probabilities from hypergeometric estimates; Hand-trap and interaction read from card text; Going-first and going-second power from composition and text
- Provisional: Matchup and format fit (no dated meta sample); Meta Power null
- Data gaps: no combos supplied: combo floor, median and ceiling are text-only inference no tournament link: archetype meta-share and pilot record absent no win-rate telemetry: going-first/second, matchup and brick rates are Inferred or Unknown Meta Power is Provisional unless a dated metagame sample is supplied deck title is null in the export
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