Umbral Horror Deck #768339 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

Final Contextual Deck Power: 35/100 (±8 · Confidence: Low)

• Primary strategy: Midrange
• Secondary strategies: Combo, Stun
• Format: ocg

Legality

Main 40 / Extra 15 / Side 0 — status: Illegal. 1 violation(s).

Identity & game plan

• Win condition: Xyz Summon high-ATK Umbral Horror / Number / Masquerade boss monsters from the Extra Deck, supported by Barian's and Umbral Horror searchers; Number Xyz boards that negate or destroy opponent cards and monsters (Masquerade, Heraldry Crest, Utopia Emissary)
• Turn 1 (going first): Open a Level 4 Umbral Horror or Gorgonic starter, search via V Umbral Horror or Gorgonic into Barian's Seventh Untopia, then Xyz into a Number boss while holding Ash Blossom and Infinite Impermanence for the first disruption
• Turn 2 (going second): Hold Ash Blossom, Infinite Impermanence and Barian's Seal as hand traps against the opponent's starter, then rebuild through Mulcharmy Fuwalos draws and Umbral Horror searches
• Recovery: Searchers (11 copies) and Mulcharmy Fuwalos rebuild the hand from the Deck; Barian's Hope and Number Xyz material transfer restore board presence
• After siding: Not evaluable: side_count is 0 in the export, so no post-side plan exists in the evidence

Why it scores here

The deck is Illegal as exported: three copies of Ash Blossom & Joyous Spring against a Semi-Limited limit of two, so it receives a capped, structural-only score. Its system reads as a Midrange Xyz deck: the 19-card archetype core has a 0.97 hypergeometric chance of at least one copy in a 5-card opening hand, and the 11 searcher effects give roughly 0.82 odds of a search in hand, which keeps the engine reachable. Its interaction density is the strongest part, with 5 hand traps, Infinite Impermanence, Barian's Seal and several Xyz negate or destroy effects, which lifts the going-second read. Conversion and floor scores are held down because the export contains no recorded boards, so the ceiling and median are text-only inferences, and the Extra Deck spans several sub-archetypes (purity 18.2%) with no side deck. Popularity from usage statistics confirms the list is a real, accessible build; it did not add points, and card scores were not averaged.

Dimension scores

How the score was computed

Strategy profile: Midrange. Structural ≈ 56, Going First ≈ 55, Going Second ≈ 60, Meta = provisional, Tournament Reliability ≈ 45. Modifiers: banlist exposure (-8); no side deck (-4). Final formula: Pre-cap: 0.80*56 + 0.20*45 + modifiers(-12) = 42; capped to 35 because legality status is Illegal (theoretical/structural-only). Meta provisional.

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.34 · 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

• Archetype core and searcher density make the engine reachable on most openings
• Five hand traps plus Barian's Seal give layered going-second interaction
• Xyz boss options reach 2700 to 3100 ATK with negate or destroy effects

Weaknesses

• Illegal copy count on Ash Blossom & Joyous Spring
• No side deck in the export
• Low exact-archetype purity (18.2%) spreads the Extra Deck across sub-archetypes

Critical choke points

• Single-copy Terraforming and Number 104 Masquerade require specific material routes
• Ash Blossom over-limit means the legal list must drop one copy before any real play rate is meaningful

Recommended changes

Evidence & confidence

• Verified: Main 40, Extra 15, Side 0 against OCG size rules 40-60 / 0-15 / 0-15; Ash Blossom & Joyous Spring: 3 copies run, Semi-Limited legal limit 2 (over limit); Terraforming Limited, 1 copy run (legal); Archetype usage stats available: core cards Ash Blossom 81%, Mulcharmy Fuwalos 81%, Thousand Umbral Horror 73%
• Inferred: Hypergeometric openings: 3-copy card 0.34, archetype core 0.97, searcher group 0.82, hand trap going second 0.58; Midrange primary strategy from Xyz engine, hand traps and searcher density; Interaction quality and resilience estimates from card text
• Provisional: Meta Power and D13 matchup fit: no dated meta sample or tournament link
• Data gaps: No combos supplied: floor, median and ceiling are text-only inference No tournament link: archetype meta-share and per-pilot record absent No win-rate telemetry (going-first/second, matchup, brick/starter rates) No side deck (side_count 0) Meta Power provisional without a dated metagame sample Deck title is null