Umi Deck #772044 — Yu-Gi-Oh! OCG
41 Main, 15 Extra, incl. First Penguin x3, Mulcharmy Purulia x3, Neptabyss, the Atlantean Prince x3. Created Oct 21, 2026 by YGO Mod.
Created by: YGO Mod (20517634)
Created On: 10/21/2026
Main Deck (41)
- Abyssrhine, the Atlantean Spirit x1
- Atlantean Dragoons x2
- Atlantean Heavy Infantry x1
- Droll & Lock Bird x1
- First Penguin x3
- Levia-Dragon of Atlantis - Daedalus x1
- Maxx "C" x1
- Monster Arms of Atlantis x2
- Mulcharmy Purulia x3
- Neptabyss, the Atlantean Prince x3
- Ocean Dragon Lord - Kairyu-Shin x1
- Poseidra, the Storming Atlantean x2
- Siren Vortex of Atlantis x2
- Warchief of Atlantis x3
- Magicalibra x1
- Ash Blossom & Joyous Spring x2
- Advent of Atlantis x2
- Atlantis, City of the Sea Dragon x1
- Call of Atlantis x1
- Fish Sonar x3
- Instant Fusion x1
- Daedalus Maelstrom x1
- Dominus Impulse x2
- Virtue Stream x1
Extra Deck (15)
- Elder Entity Norden x1
- Azure Ocean Dragon Lord - Neo-Daedalus Rage x2
- Levia-Dragoon - Daedalus x2
- Marincess Coral Anemone x1
- Brionac, Dragon of the Ice Barrier x1
- Deep Sea Repetiteur x1
- Abysstrite, the Atlantean Spirit x1
- Bahamut Shark x2
- LeVirtue Dragon x1
- Mermail Abyssgaios x1
- Poseidra Abyss, the Atlantean Dragon Lord x1
- Toadally Awesome x1
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30± 6/ 100
Power Score
Structural
50
Reliability
45
Going First
50
Going Second
45
Deck — Deck Power Evaluation
Final Contextual Deck Power: 30/100 (±6 · Confidence: Medium)
| Overall score | Value |
|---|---|
| Structural Deck Power | 50 |
| Going First | 50 |
| Going Second | 45 |
| Meta Power | provisional |
| Tournament Reliability | 45 |
- Primary strategy: Combo
- Secondary strategies: Midrange, Toolbox
- Format: ocg
Legality
Main 41 / Extra 15 / Side 0 — status under the rules at evaluation time: Illegal. 1 violation(s).
Identity & game plan
- Win condition: Umi/Atlantis monster-field engine converting into Extra Deck link and xyz boards (Poseidra Abyss, Mermail Abyssgaios, Azure Ocean Dragon Lord, Levia-Dragoon) for board pressure; Direct attacks via Atlantean Dragoons and Poseidra's attack-protection effect
- Turn 1 (going first): Open a Penguin, Atlantean or Atlantis starter, search Atlantis or Umi through Warchief, Neptabyss or Fish Sonar, and build toward a link or xyz board
- Turn 2 (going second): Use Ash Blossom, Maxx C, Droll and Dominus Impulse to slow the opponent's summons, then rebuild through the GY-recursion lines
- Recovery: Recover from the GY via Warchief, Monster Arms, Siren Vortex and Atlantis-mentioning monsters
- After siding: No side deck is registered, so there is no post-side plan
Why it scores here
This Umi list is scored as a system, not as an average of its cards. Its archetype core (about 97% chance of at least one core card in a 5-card opening hand, Inferred) makes the engine reliably start, and the Extra Deck gives it real closing power through Poseidra Abyss and Abyssgaios. Conversion ceiling and median output could not be measured, because no combo boards were supplied and these dimensions rest on text reads only. Interaction is spread across Ash Blossom, Maxx C, Droll and Dominus Impulse, which adds resilience, but the deck has no side deck to adapt. The list runs Forbidden Bahamut Shark twice, so the deck is Illegal; the score is capped at 30 and treated as structural only. Popularity and archetype usage did not earn points, and the score does not rest on averaging card scores.
Dimension scores
| # | Dimension | Score | Evidence |
|---|---|---|---|
| D1 | Engine Accessibility & Consistency | 58 | P(at least one Atlantis/Umi starter in 5 cards) is high across the 20-card core group (0.9728); the core is consistent, but the cards are spread across sub-archetypes (Inferred) |
| D2 | Opening-Hand Quality & Brick Management | 55 | Copy spread is mostly 2-3 copies with 12 singletons; some opening-hand redundancy and dead-card risk from the many Atlantis-only cards (Inferred) |
| D3 | Combo Conversion & Ceiling | 40 | No combo boards supplied; ceiling is inferred from Poseidra Abyss, Levia-Dragon and Abyssgaios text only (Inferred) |
| D4 | Combo Floor & Median Output | 35 | No recorded combo median; the floor is estimated from text-only starters and is provisional (Provisional) |
| D5 | Interruption Resilience & Route Redundancy | 55 | Recursion from the GY (Warchief, Monster Arms, Siren Vortex) and multiple starters give some route redundancy (Inferred) |
| D6 | Resource Economy, Recovery & Grind | 50 | Recovery from the GY and search text exist, but Extra Deck material spend is not measured (Inferred) |
| D7 | End-Board & Interaction Quality | 55 | Ash Blossom, Maxx C, Droll, Dominus Impulse and Daedalus Maelstrom give layered interaction (Inferred semantic read of negation/removal text) |
| D8 | Going-Second & Board-Breaking Power | 50 | Going-second split not measurable; Dominus Impulse and Maxx C help, but removal density is thin (Inferred) |
| D9 | Offensive Pressure & Closing Power | 60 | Poseidra Abyss (3000 ATK) and Abyssgaios give closing power; no end-board data supplied (Inferred) |
| D10 | Main Deck Efficiency & Flexibility | 55 | 41 main-deck cards with 24 distinct cards; the exact-name Umi purity is 5.4%, so related sub-archetypes spread the engine (Inferred) |
| D11 | Extra Deck Efficiency & Coverage | 60 | Extra Deck uses 15 cards across xyz, link, synchro and fusion; several Extra cards need specific materials (Verified composition, Inferred use) |
| D12 | Side Deck Adaptability | 15 | Side deck is empty (Side Deck size 0), so there is no post-side adaptation (Verified) |
| D13 | Matchup Coverage & Format Fit | 30 | No tournament link or dated meta sample; matchup and format fit cannot be scored from evidence (Provisional) |
| D14 | Pilotability & Error Tolerance | 50 | Many cards with multi-step Atlantis/Umi chains and several Extra Deck materials; moderate decision load (Inferred) |
How the score was computed
Strategy profile: Combo. Structural ≈ 50, Going First ≈ 50, Going Second ≈ 45, Meta = provisional, Tournament Reliability ≈ 45. Modifiers: banlist exposure (-8); no Side Deck (-4). Final formula: 0.80*Structural(50) + 0.20*TournamentReliability(45) = 49; modifiers -12 gives 37; Illegal cap applied, final = 30 (theoretical/structural only). Meta Power provisional.
Probability & combo summary
- Opening a starter: P(≥1) ≈ 0.97 · key two-card combo ≈ — · full-brick estimate ≈ 0.03 (all Inferred)
- Combo output: best PowerIndex —, median —, board-per-starter —
- Turn order: 0 going-first lines vs 0 going-second lines
Strengths
- Large searcher and engine density (20 searcher-text cards)
- Strong Extra Deck closing options (Poseidra Abyss, Abyssgaios, Neo-Daedalus Rage)
- Layered interaction from Ash Blossom, Maxx C, Droll and Dominus Impulse
Weaknesses
- Illegal: Bahamut Shark run 2 copies while Forbidden
- No side deck
- No combo evidence to confirm conversion or median output
- Low exact-archetype purity (5.4%) with many off-archetype cards
Critical choke points
- Bahamut Shark must be removed before the list is playable
- Dependence on Atlantis/Umi field presence for most engine lines
Recommended changes
| Priority | Remove | Add | Reason |
|---|---|---|---|
| 1 | Bahamut Shark (2 copies) | A legal Extra Deck card or 2 copies of a legal Xyz/Link | Forbidden card run over the copy limit; the deck is Illegal until fixed |
| 2 | One off-archetype card | An additional Umi/Atlantis engine card | Raises exact-archetype coherence and engine consistency |
| 3 | None | A side deck of 15 cards | Enables post-side adaptation; currently D12 is 15 |
Evidence & confidence
- Verified: Bahamut Shark is Forbidden and run 2 copies (legal 0), so the deck is Illegal; Main deck 41 cards and Extra Deck 15 cards are within size rules; Side deck is empty; Core-card inclusion stats exist for Umi (20 rows)
- Observed: Usage statistics show Atlantis, Mulcharmy, Daedalus Maelstrom and Warchief as high-inclusion core cards
- Inferred: D1 opening-hand consistency from hypergeometric estimates; Combo ceiling and floor from card text only; Interaction quality from negation and removal text
- Provisional: Meta Power (no dated metagame sample); Matchup and format fit (D13); Median combo output (no recorded boards)
- 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 win-rate telemetry exists in YGOVN — those signals are Inferred or Unknown Meta Power is Provisional unless a dated metagame sample is supplied no side deck registered
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