Mermail Deck #769495 — Yu-Gi-Oh! OCG
40 Main, 15 Extra, incl. Atlantean Dragoons x3, Mermail Abyssteus x3, Mermail Shadow Squad x3. Created Oct 20, 2026 by YGO Mod.
Created by: YGO Mod (20517634)
Created On: 10/20/2026
Main Deck (40)
- Abyssrhine, the Atlantean Spirit x2
- Atlantean Dragoons x3
- Atlantean Heavy Infantry x1
- Eria the Water Channeler x1
- Guitar Gurnards Duonigis x1
- Mermail Abysspike x2
- Mermail Abyssteus x3
- Mermail Shadow Squad x3
- Moulinglacia the Elemental Lord x1
- Neptabyss, the Atlantean Prince x3
- Poseidra, the Storming Atlantean x3
- Superancient Deepsea King Coelacanth x1
- Deep Sea Diva x1
- Gluttonous Reptolphin Greethys x1
- Icejade Ran Aegirine x1
- Abyss-sting Triaina x1
- Deep Sea Aria x2
- Forbidden Droplet x2
- Harpie's Feather Duster x1
- Lightning Storm x2
- One for One x1
- Raigeki x1
- Infinite Impermanence x2
- Virtue Stream x1
Extra Deck (15)
- Marincess Coral Anemone x1
- Mermail Abyssalacia x1
- Mermail King - Neptabyss x1
- Adamancipator Risen - Dragite x1
- Icejade Gymir Aegirine x1
- Swordsoul Supreme Sovereign - Chengying x1
- White Aura Monoceros x1
- White Aura Whale x1
- Deep Sea Prima Donna x1
- Abysstrite, the Atlantean Spirit x1
- LeVirtue Dragon x1
- Mermail Abyssgaios x1
- Number 4: Stealth Kragen x1
- Poseidra Abyss, the Atlantean Dragon Lord x1
- Snowdust Giant x1
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56± 7/ 100
Power Score
Structural
62
Reliability
52
Going First
66
Going Second
60
Deck — Deck Power Evaluation
Final Contextual Deck Power: 56/100 (±7 · Confidence: Medium)
| Overall score | Value |
|---|---|
| Structural Deck Power | 62 |
| Going First | 66 |
| Going Second | 60 |
| Meta Power | provisional |
| Tournament Reliability | 52 |
- Primary strategy: Midrange
- Secondary strategies: Toolbox
- Format: ocg
Legality
Main 40 / Extra 15 / Side 0 — status: Legal.
Identity & game plan
- Win condition: Extra Deck Xyz/Synchro/Link bosses from the Atlantean/Mermail engine: Poseidra Abyss, Abysstrite, Mermail Abyssgaios, Poseidra-line attackers; Synchro beatsticks (White Aura Monoceros/Whale, Icejade Gymir, Swordsoul Chengying) backed by Mermail King - Neptabyss and Mermail Abyssalacia
- Turn 1 (going first): Normal Summon Mermail Abyssteus or Neptabyss and chain searches (Abyssteus, Abysspike, Neptabyss, Dragoons) into a Level 7 WATER boss via Shadow Squad level-change and Synchro/Xyz
- Turn 2 (going second): Hand trap (Infinite Impermanence) or Forbidden Droplet to break the opponent's first board, then rebuild through GY-revival effects (Abyss-sting Triaina, Abysspike, Shadow Squad) into an Extra Deck boss
- Recovery: Searchers (16 search-text cards) and GY effects of WATER monsters (Shadow Squad, Atlantean Heavy Infantry, Dragoons) rebuild the hand; Deep Sea Aria and Neptabyss refill after a wipe
- After siding: No Side Deck registered (side_count 0); no post-side plan can be evaluated from the evidence
Why it scores here
The deck opens a functional plan reliably: 16 search-text cards in 40 give P(at least one searcher in a 5-card opener) of about 0.94 (hypergeometric, Inferred), and the Mermail/Atlantean searchers chain into Level 7 bosses, which is where the structural score comes from. Conversion and floor are only text-inferred because no recorded boards exist, so D3 and D4 are capped at moderate values. Interaction (two Infinite Impermanence, two Forbidden Droplet, Raigeki, Harpie's Feather Duster, Lightning Storm, Virtue Stream) and GY-recursion carry the resilience and grind scores, while side-deck weakness (no side) and a 12.7% exact-archetype purity (the list splits across Atlantean, Mermail, Abyss-, Icejade, White, and Cyclone) hold the score down. The score comes from consistency, redundancy, and closing power on the system, not from Mermail being a popular archetype or from averaging card scores.
Dimension scores
| # | Dimension | Score | Evidence |
|---|---|---|---|
| D1 | Engine Accessibility & Consistency | 74 | P(at least one searcher in 5 cards) = 0.94 across 16 searcher-text copies; 3-copy starters on Abyssteus, Neptabyss and Dragoons (Inferred) |
| D2 | Opening-Hand Quality & Brick Management | 58 | 13 singletons and 8 tech/spell-trap slots (Raigeki, Duster, One for One, Droplet) add dead-card risk without a target; 2 hand traps (Inferred) |
| D3 | Combo Conversion & Ceiling | 66 | Extra Deck Xyz/Synchro ceiling (Abysstrite, Poseidra Abyss, Mermail Abyssgaios, Stealth Kragen) read from card text; no recorded boards (Inferred, text-only) |
| D4 | Combo Floor & Median Output | 52 | No recorded boards, so median output is unmeasured; estimated from starter diversity and searcher density (Inferred, low certainty) |
| D5 | Interruption Resilience & Route Redundancy | 62 | Several independent starters (Neptabyss, Abyssteus, Shadow Squad, Dragoons, Poseidra, Greethys) and GY revival lines; no sequence data (Inferred) |
| D6 | Resource Economy, Recovery & Grind | 70 | Searcher density and WATER-monster GY costs/recursion refill hand after exchanges (Inferred from text) |
| D7 | End-Board & Interaction Quality | 68 | Negations/removal present: 2 Infinite Impermanence, 2 Forbidden Droplet, Raigeki, Harpie's Feather Duster, Lightning Storm, Virtue Stream; Abysstrite and Gaios add on-field negation (Inferred semantic read) |
| D8 | Going-Second & Board-Breaking Power | 64 | 3-copy Droplet/Impermanence and Raigeki/Lightning Storm give going-second board-breaking; P(hand trap in 6 cards) = 0.28 (Inferred) |
| D9 | Offensive Pressure & Closing Power | 74 | Level 7-10 Synchro/Xyz bosses at 2800-3000 ATK (Poseidra Abyss 3000, Chengying 3000, Gaios 2800, Whale 2800) (Verified stat, Inferred closing) |
| D10 | Main Deck Efficiency & Flexibility | 55 | 40 main with 24 distinct cards and 8 tech slots; archetype exact-name purity 12.7%, so engine coherence is split across sub-archetypes (Inferred) |
| D11 | Extra Deck Efficiency & Coverage | 66 | Full 15-card Extra Deck (6 Synchro, 6 Xyz, 3 Link) with flexible boss options but no single enforced card beyond Abysstrite/Poseidra Abyss (Inferred) |
| D12 | Side Deck Adaptability | 22 | No Side Deck registered (side_count 0), so no post-side adaptation can be credited (Provisional) |
| D13 | Matchup Coverage & Format Fit | 50 | Archetype usage stats are available (35 rows) but no tournament link or dated metagame; meta fit is unknown (Provisional) |
| D14 | Pilotability & Error Tolerance | 42 | Multi-step Synchro/Xyz/Link sequencing with many branch points across searches and GY costs; moderately demanding to pilot (Inferred) |
How the score was computed
Strategy profile: Midrange. Structural ≈ 62, Going First ≈ 66, Going Second ≈ 60, Meta = provisional, Tournament Reliability ≈ 52. Modifiers: Side deck absent (-2); Engine split across sub-archetypes (-2). Final formula: 0.80*Structural + 0.20*TournamentReliability + ContextModifiers (Meta provisional; Structural 61.8, TR 52, modifiers -4 => 55.8, rounded to 56)
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 searcher package (16 search-text cards) makes an engine live very often
- Extra Deck has multiple Level 7+ bosses at 2800-3000 ATK plus negation options
- Two interaction types (hand traps and spell/trap removal) and GY recursion give multiple recovery routes
Weaknesses
- No Side Deck, so best-of-3 adaptation is absent
- Low archetype purity (12.7%) with cards from several sub-archetypes
- Eight tech/spell-trap slots that go dead without matching targets
- No recorded combos or matchup telemetry to confirm the ceiling
Critical choke points
- Single-card Extra Deck bosses (Abysstrite, Poseidra Abyss) need specific materials; losing the Level 7 WATER starter stops the line
- Two hand traps only: the going-second hand has about a 28% chance of containing one
Recommended changes
| Priority | Remove | Add | Reason |
|---|---|---|---|
| 1 | One for One (1 copy) | Mermail Abysspike or Atlantean Dragoons (more starters in the core archetype) | One for One needs a Level 1 monster; this list has few Level 1 targets and it is a thin starter |
| 2 | Harpie's Feather Duster (1 copy) | Ash Blossom & Joyous Spring (1 copy) | A hand trap is more useful for going second than a mass-removal spell in a midrange shell; the Duster's target value depends on the opponent's backrow |
| 3 | Raigeki (1 copy) | A second searcher or Level 4 WATER starter | Raigeki is dead when the opponent has no monsters and the deck already has 13+ removal-text cards |
Evidence & confidence
- Verified: Main 40 / Extra 15 / Side 0 within the OCG size rules; Harpie's Feather Duster and One for One are Limited with 1 copy each (legal); Usage stats: Mermail core cards and Atlantean Dragoons appear in 57-75% of archetype lists
- Inferred: Starter access about 0.94 at 5 cards (hypergeometric); Midrange primary strategy from searcher density, removal text and Extra Deck bosses; Interaction and recursion quality from card text; Extra Deck coverage and pilot complexity from card text
- Provisional: Meta Power (no dated metagame sample); Matchup and format fit (no tournament link); Going-first and going-second scores (no win-rate telemetry)
- Data gaps: no combos supplied: combo floor, median and ceiling are text-only inference no tournament link: archetype meta share and pilot match record absent no win-rate telemetry: going-first/second, matchup, brick and starter rates are Inferred or Unknown no Side Deck registered: post-side plan cannot be evaluated Meta Power is Provisional unless a dated metagame sample is supplied
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