Umi Deck #771650 — Yu-Gi-Oh! OCG
55 Main, 12 Extra, incl. Electric Jellyfish x3, Ocean Dragon Lord - Kairyu-Shin x3, Ash Blossom & Joyous Spring x3. Created Oct 21, 2026 by YGO Mod.
Created by: YGO Mod (20517634)
Created On: 10/21/2026
Main Deck (55)
- Droll & Lock Bird x1
- Electric Jellyfish x3
- Fisherman of Legend x1
- Icejade Tremora x2
- Maiden of the Aqua x1
- Mega Fortress Whale x1
- Nibiru, the Primal Being x2
- Ocean Dragon Lord - Kairyu-Shin x3
- Warrior of Atlantis x2
- Giga Gagagigo x1
- Ash Blossom & Joyous Spring x3
- Icejade Ran Aegirine x2
- A Legendary Ocean x3
- Dark Ruler No More x3
- Fish Sonar x3
- Foolish Burial Goods x2
- Harpie's Feather Duster x1
- Hey, Space Trunade! x2
- Lightning Storm x2
- Pot of Extravagance x1
- Pot of Prosperity x1
- Sea Stealth II x1
- Terraforming x1
- Triple Tactics Thrust x3
- Evenly Matched x3
- Ice Barrier x2
- Infinite Impermanence x3
- Kairyu-Shin's Dark Reef x1
- Sea Stealth Attack x1
Extra Deck (12)
- Eria the Water Charmer, Gentle x1
- Marincess Coral Anemone x1
- S:P Little Knight x1
- Adamancipator Risen - Dragite x1
- Icejade Gymir Aegirine x1
- Swordsoul Supreme Sovereign - Chengying x2
- Divine Arsenal AA-ZEUS - Sky Thunder x1
- Number 4: Stealth Kragen x1
- Number 47: Nightmare Shark x1
- Stealth Kragen Spawn x1
- Super Starslayer TY-PHON - Sky Crisis x1
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Deck — Deck Power Evaluation
Final Contextual Deck Power: 40/100 (±12 · Confidence: Low)
| Overall score | Value |
|---|---|
| Structural Deck Power | 48 |
| Going First | 44 |
| Going Second | 54 |
| Meta Power | provisional |
| Tournament Reliability | 42 |
- Primary strategy: Midrange
- Secondary strategies: Toolbox, Stun
- Format: ocg
Legality
Main 55 / Extra 12 / Side 0 — status under the rules at evaluation time: Illegal. 2 violation(s).
Identity & game plan
- Win condition: Umi-field Water boss monsters (Swordsoul Supreme Sovereign - Chengying, Adamancipator Risen - Dragite, Icejade Gymir Aegirine, Super Starslayer TY-PHON) enabled by Umi-field protection and negation; Direct-attack pressure from Mega Fortress Whale and Water monsters once Umi is on the field
- Turn 1 (going first): Open Fish Sonar, Kairyu-Shin or Electric Jellyfish to put Umi (A Legendary Ocean, or Maiden of the Aqua as a field-Umi substitute) on the field, then protect it with Ash Blossom and Infinite Impermanence
- Turn 2 (going second): Hold up hand traps (Ash Blossom, Infinite Impermanence, Evenly Matched, Droll & Lock Bird, Nibiru) to answer the opponent's first summon or search, then build a Water board through Kairyu-Shin's Dark Reef and Icejade summons
- Recovery: Recover through Warrior of Atlantis and Fish Sonar searches for A Legendary Ocean, and Pot of Prosperity / Pot of Extravagance draws; Foolish Burial Goods and Mega Fortress Whale provide recursion-adjacent card flow
- After siding: No side deck is registered, so no post-side plan exists; a legal build would need a 0-15 card side to add narrow Umi-breakers or hand traps
Why it scores here
The deck is scored as a system: it reliably reaches an Umi field only about 25% of the time from a 5-card opening hand (three copies of A Legendary Ocean, hypergeometric, Inferred), so its T1 plan depends on several redundant access routes (Fish Sonar, Kairyu-Shin, Electric Jellyfish, Warrior of Atlantis) rather than one starter. Interaction is the strongest axis: 12 hand traps and 14 negation-text cards give high going-second answer density (P(≥1 hand trap in 6) ≈ 0.79, Inferred), which is why D7 and D8 score well. Conversion is the weakest point: there are no recorded boards, so ceiling and median output are text-only inferences, and 56 of 111 Main copies are off-archetype, which lowers coherence. Popularity did not earn points: the Umi archetype's usage stats show only 3 of 16 core cards present, and no tournament data exists. The score is not an average of card scores. It is capped because the list runs three copies of Ash Blossom & Joyous Spring against a legal limit of two, so the result is theoretical and structural-only.
Dimension scores
| # | Dimension | Score | Evidence |
|---|---|---|---|
| D1 | Engine Accessibility & Consistency | 45 | P(≥1 A Legendary Ocean in 5) ≈ 0.25; access spread across Fish Sonar, Kairyu-Shin and Jellyfish; 3 of 16 usage-core cards present (Inferred) |
| D2 | Opening-Hand Quality & Brick Management | 40 | 12 hand traps, 21 tech cards and 33 zero-Level spells/traps create dead-card risk; P(≥1 hand trap in 6 going second) ≈ 0.79 (Inferred) |
| D3 | Combo Conversion & Ceiling | 40 | No parseable combos; ceiling is a text-only read of Umi-field plus Kairyu-Shin and Chengying lines (Inferred) |
| D4 | Combo Floor & Median Output | 35 | No recorded boards, so median output cannot be measured; expected output is low-to-medium from text alone (Inferred) |
| D5 | Interruption Resilience & Route Redundancy | 50 | Multiple hand-trap and negation answers plus a second Umi route give partial recovery after one interruption (Inferred) |
| D6 | Resource Economy, Recovery & Grind | 50 | Draw and search density is high (16 searcher-text cards, two Pots) but spends Extra Deck cards and card advantage is uncertain (Inferred) |
| D7 | End-Board & Interaction Quality | 70 | 14 negation-text and 16 removal-text cards on a layered Umi-field protection plan; Ash x3 exceeds legal copies (Inferred semantic) |
| D8 | Going-Second & Board-Breaking Power | 65 | Hand-trap density on going second plus negation/removal text; hard to confirm without boards (Inferred) |
| D9 | Offensive Pressure & Closing Power | 62 | Five 2900-3000 ATK Extra Deck boss monsters plus Whale direct-attack text (Verified stats, Inferred closing) |
| D10 | Main Deck Efficiency & Flexibility | 40 | 55 Main slots with 29 distinct cards, 21 tech and 33 zero-Level spells/traps; compact-to-moderate efficiency at best (Inferred) |
| D11 | Extra Deck Efficiency & Coverage | 60 | 12 Extra Deck slots spanning Synchro, XYZ and Link with three Umi-compatible bosses; coverage is broad (Verified composition) |
| D12 | Side Deck Adaptability | 10 | Side deck is empty; no post-side plan exists (Verified) |
| D13 | Matchup Coverage & Format Fit | 45 | No tournament link, no dated meta sample; Umi meta-share unknown (Provisional) |
| D14 | Pilotability & Error Tolerance | 50 | Multi-step Umi lines and several timing-dependent hand traps; moderate decision load (Inferred) |
How the score was computed
Strategy profile: Midrange. Structural ≈ 48, Going First ≈ 44, Going Second ≈ 54, Meta = provisional, Tournament Reliability ≈ 42. Modifiers: copy-limit violation (-7). Final formula: Illegal cap: Structural 48 with 0.80*Structural + 0.20*TournamentReliability = 47, then copy-limit modifier -7 = 40 (theoretical, structural-only; Meta provisional)
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 hand-trap and negation package (12 hand traps, 14 negation-text cards) gives strong going-second interaction
- Five Extra Deck boss monsters at 2900-3000 ATK provide closing power
- Broad Extra Deck coverage across Synchro, XYZ and Link
Weaknesses
- Illegal list: Ash Blossom & Joyous Spring run 3x against a legal limit of 2
- Low Umi purity (16.4% exact-name); 56 of 67 archetype-tagged copies are off-archetype
- No recorded boards, so combo ceiling and floor are unmeasured
- No side deck
Critical choke points
- A Legendary Ocean access: P(≥1 in opening 5) ≈ 0.25, so the Umi field is often late
- Umi-field protection depends on a single field-spell route if Warrior and Fish Sonar are blocked
Recommended changes
| Priority | Remove | Add | Reason |
|---|---|---|---|
| 1 | One copy of Ash Blossom & Joyous Spring | Any legal card | Restores legality; the deck cannot receive a normal score while over the copy limit |
| 2 | Two or three tech cards (e.g. Terraforming, Harpie's Feather Duster) | Additional Umi or Water searchers or side-deck hand traps | Raises Umi access and gives a post-side plan; the side deck is currently empty |
Evidence & confidence
- Verified: Illegal status: Ash Blossom & Joyous Spring 3 copies vs legal 2; Main 55 and Extra 12 are within OCG size rules (40-60 / 0-15); Usage stats: 3 of 16 core cards present; Side count is 0
- Inferred: P(≥1 A Legendary Ocean in 5) ≈ 0.25 and hand-trap density; Negation and removal semantics from card text; Boss-monster closing power from ATK values
- Provisional: Meta power and matchup fit (no dated metagame sample)
- Data gaps: No combos supplied: floor, median and ceiling are text-only inference No tournament link: archetype meta-share and per-pilot match record absent No win-rate telemetry for going-first or going-second No side deck: post-side performance cannot be assessed Meta Power is Provisional without a dated metagame sample
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