White Forest Deck #759660 — Yu-Gi-Oh! Master Duel

49 Main, 21 Extra, incl. Therion 'Lily' Borea x3, White Sardine x3, White Stingray x3. Created Oct 2, 2026 by YGO Mod.

Created by: YGO Mod (20517634)

Created On: 10/02/2026

Official AI Deck Power Analysis

MidrangeConfidence: LowEvaluated Oct 20, 2026

30± 8/ 100

Power Score

Structural 42

Reliability 40

Going First 40

Going Second 38

Deck — Deck Power Evaluation

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

Overall score	Value
Structural Deck Power	42
Going First	40
Going Second	38
Meta Power	provisional
Tournament Reliability	40

Primary strategy: Midrange
Secondary strategies: Toolbox
Format: master-duel

Legality

Main 49 / Extra 21 / Side 0 — status: Illegal. 1 violation(s).

Identity & game plan

Win condition: Synchro pressure from White Aura Bihamut, White Aura Whale and White Aura Monoceros, backed by Therion and White Forest engine pieces; Link and Synchro follow-ups (Unchained Soul Lord of Yama, Vampire Fascinator, White Aura Dolphin)
Turn 1 (going first): Search or draw into a White Fish or Therion starter (Stingray, Sunfish, Lily Borea, Circle Reef), then reach a Synchro Summon for board presence and disruption
Turn 2 (going second): Open with a 6-card hand that contains a starter and a searcher, then use Sunfish/Stingray recursion and trap-based negation to reach a Synchro boss
Recovery: Recycle Fish and Therion monsters from the GY through Therion Stand Up!, Sunfish and Monoceros, and rebuild through Yang Zing Path and Therion Discolosseum
After siding: Not applicable: no Side Deck is registered in this Master Duel list, so no post-side plan can be evaluated

Why it scores here

This list is Illegal in Master Duel because its Extra Deck holds 21 cards against a maximum of 15, so it receives a capped structural-only score rather than a normal contextual score. Its 49-card Main Deck is within the legal 40-60 range, and the engine (White Stingray, White Sunfish, Therion Lily Borea, White Reincarnation) has a searcher density of about 13 texted cards, giving roughly 80% odds of at least one searcher in an opening hand of five (Inferred). Interaction is real but thin: 17 removal-text cards and 5 negation-text cards, with no hand traps and no floodgates. The score comes from consistency and interaction on the system, not from White Forest being a recognised archetype and not from averaging the individual card scores. The combo ceiling and median are unmeasured because no recorded boards exist, so those dimensions carry the lowest confidence.

Dimension scores

#	Dimension	Score	Evidence
D1	Engine Accessibility & Consistency	45	P(at least one of any 3-copy starter in a 5-card opening hand) is about 0.28 and P(at least one searcher-text card) is about 0.80; no usage-stat core is present in the list (Inferred)
D2	Opening-Hand Quality & Brick Management	42	23 Spell/Trap cards and only 3 Normal Monsters with a 22-distinct main deck; conflicting Summon requirements across Fish, Therion and Synchro lines raise brick risk (Inferred)
D3	Combo Conversion & Ceiling	40	No parseable recorded boards; ceiling is judged from card text alone, e.g. Aura Bihamut's Divine Dragon Token line and Stingray/Sunfish recursion (Inferred)
D4	Combo Floor & Median Output	35	No recorded board median or power distribution exists; floor is estimated from the single-starter bootstrap and narrow searcher chains (Inferred)
D5	Interruption Resilience & Route Redundancy	45	Recursion from GY via Sunfish, Stand Up!, Discolosseum and Yang Zing Path plus 17 removal-text cards gives some independent routes (Inferred)
D6	Resource Economy, Recovery & Grind	50	13 searcher-text cards and several GY-to-field recovery effects support a rebuild loop, but Extra Deck over-limit makes the resource plan unreliable (Inferred)
D7	End-Board & Interaction Quality	50	17 removal-text cards and 5 negation-text cards (Therion Cross, Regulus, Fairy Tail Sleeper) with no hand traps or floodgates (Inferred)
D8	Going-Second & Board-Breaking Power	40	Going-second combo split unavailable; board breaking relies on Aura Whale attacks and Therion Irregular effects with no recorded data (Inferred)
D9	Offensive Pressure & Closing Power	55	Synchro bosses at 3300, 2800 and 2500 ATK plus piercing text on Aura Whale give a real closing package (Verified card text)
D10	Main Deck Efficiency & Flexibility	45	49 Main cards across 22 distinct cards; 7 singletons, 12 three-copy slots, and a legal Main size, but core redundancy is unclear without an archetype core stat (Inferred)
D11	Extra Deck Efficiency & Coverage	25	Extra Deck runs 21 cards against a 15-card maximum (Verified legality); 17 Synchro monsters are over-committed and the illegal count caps the score (Verified)
D12	Side Deck Adaptability	20	No Side Deck registered; Master Duel gives no post-side plan, so this scores on the provisional default only (Provisional)
D13	Matchup Coverage & Format Fit	40	No tournament link and no dated metagame sample; Meta Power is provisional and this dimension is scored neutrally (Provisional)
D14	Pilotability & Error Tolerance	45	The engine has Fish recursion, Therion equips and Synchro chains, which is multi-step and needs many decision points (Inferred)

How the score was computed

Strategy profile: balanced. Structural ≈ 42, Going First ≈ 40, Going Second ≈ 38, Meta = provisional, Tournament Reliability ≈ 40. Modifiers: illegal_extra_deck_size (-12). Final formula: 0.80*Structural + 0.20*TournamentReliability (Meta provisional) = 41.6, then illegal-extra-deck modifier -12 = 29.6, rounded to 30

Probability & combo summary

Opening a starter: P(≥1) ≈ 0.28 · 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

Searcher density (13 texted cards) gives about 80% odds of at least one searcher in five cards (Inferred)
Synchro boss package with Aura Bihamut 3300 ATK and Aura Whale 2800 ATK plus piercing text
Recursion from the GY across Fish, Therion and Yang Zing lines

Weaknesses

Extra Deck over the legal maximum (21 vs 15), making the list unplayable as built
No hand traps or floodgates; interaction is trap-dependent
No recorded boards, so combo conversion is unmeasured
No Side Deck, so no post-side adaptability

Critical choke points

Extra Deck legality: the list must cut 6 Extra cards to become playable
Dependence on a Fish or Therion starter in hand for the opening turn
Single Synchro-boss line with no independent second threat

Recommended changes

Priority	Remove	Add	Reason
1	Six Extra Deck cards (e.g. Mind Castlin, Circle of the Fairies, one Synchro copy of Porpoise or Dolphin)	No replacement required; the deck is legal at 15 Extra cards	Clears the Extra Deck size violation, which is the only reason this deck is capped
2	One of the singleton non-core Synchro/Link cards	A second searcher or a hand-trap-style negation card	Raises consistency and interaction without changing the engine (Inferred)

Evidence & confidence

Verified: Legality: Main 49 within 40-60, Extra 21 over 15 (status Illegal); Fire King High Avatar Kirin is Semi-Limited with 2 legal copies and 1 copy run (legal); Card text and stats for all 49 Main and 21 Extra cards as exported; Usage stats: 17 core rows, 0 present, so the list does not run the archetype-standard core
Inferred: Opening-hand probabilities (hypergeometric, Main Deck only); Searcher and interaction density from text hints; Going-first and going-second estimates; Recursion and resilience read from card text
Provisional: Meta Power and format fit (no dated metagame sample); Side Deck adaptability (no Side Deck registered)
Data gaps: no combos supplied: combo floor, median and ceiling are text-only inference no tournament link: archetype meta-share and per-pilot match record absent no win-rate telemetry (going-first/second, matchup, brick/starter rates) exists in YGOVN Meta Power is provisional without a dated metagame sample Deck title is null in the export

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More Master Duel Info

White Forest Breakdown