Umbral Horror Deck #770149 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

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

• Primary strategy: Combo
• Secondary strategies: Toolbox
• Format: ocg

Legality

Main 55 / Extra 15 / Side 0 — status: Illegal. 2 violation(s).

Identity & game plan

• Win condition: Xyz Summon Number and Masquerade monsters (Number 39: Utopia, Number C104, Number 104: Masquerade V, Number 99) from the Extra Deck and attack or use their detach-based removal effects to close.; Barian's and Seventh spell-based searches that feed Extra Deck Xyz lines; a few one-card Umbral Horror and Gagaga boards.
• Turn 1 (going first): Open a Gagaga, Zubaba, Gogogo or Dododo starter, search or summon a second body, then Xyz Summon a Number monster or Masquerade through Barian's Seventh Untopia or Gagaga Utopic Tactics.
• Turn 2 (going second): Hold Ash Blossom, Solemn Accusation and Barian's Seal for interaction, then convert the survivors into a Xyz board through Thousand Umbral Horror or Shining Umbral Horror.
• Recovery: Return Umbral Horror and Gagaga monsters from the GY through V Umbral Horror, Gorgonic Umbral Horror and Onomatopickup, then rebuild a single Xyz line from the Deck.
• After siding: Not evaluable: the export contains no Side Deck, so there is no post-side plan to score.

Why it scores here

The deck's engine is reasonably accessible: 14 archetype-core copies give P(at least one in a 5-card opening hand) of about 0.78, and 21 searcher-text cards give about 0.92, so most hands can find a starter. Interaction is layered across three hand traps, Solemn Accusation, Barian's Seal, Unbreakable Xyz Barrier, and several Number monsters with negation text, which supports resilience. The Extra Deck carries high-ATK closers (Number C104 at 3000 ATK, Number 99 at 3000 ATK, Number 104 at 2700 ATK), which lifts closing power. Score comes from consistency, interaction and closing power on the system, not from the Umbral Horror archetype's popularity or from averaging card scores. The list is Illegal (Ash Blossom at 3 copies vs a limit of 2, Seventh Tachyon at 2 vs 1), so the final number is capped at 30, the deck has no Side Deck, and no combo boards exist, so the score is structural and low-confidence.

Dimension scores

How the score was computed

Strategy profile: Combo. Structural ≈ 54, Going First ≈ 52, Going Second ≈ 50, Meta = provisional, Tournament Reliability ≈ 45. Modifiers: banlist_exposure (-8); illegal_cap (-14). Final formula: Structural 54 = sum(D x Combo weights)/100; pre-cap 0.80*54 + 0.20*45 = 52.2; modifiers -8 (banlist) and -14 (Illegal cap) = 30. Meta provisional. Illegal decks get no normal Final score; this is a capped, structural-only read.

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.78 · key two-card combo ≈ — · full-brick estimate ≈ 0.22 (all Inferred)
• Combo output: best PowerIndex —, median —, board-per-starter —
• Turn order: 0 going-first lines vs 0 going-second lines

Strengths

• Layered interaction: three hand traps, Solemn Accusation, Barian's Seal and Unbreakable Xyz Barrier
• High searcher density (21 cards) gives reliable starter access
• Strong Extra Deck closers at 2500-3000 ATK

Weaknesses

• Illegal list: Ash Blossom at 3 copies and Seventh Tachyon at 2 copies exceed OCG limits
• Mixed sub-archetypes (8.6 percent exact-name purity) weaken engine coherence
• No Side Deck: no post-side plan or adaptability

Critical choke points

• Dependence on Xyz Summon from the Extra Deck for every closer
• Fixing the two over-limit cards removes the legality cap but changes interaction density

Recommended changes

Evidence & confidence

• Verified: Legality: Illegal; Ash Blossom 3 copies vs 2 legal; Seventh Tachyon 2 copies vs 1 legal (OCG BanList); Main 55, Extra 15, Side 0 within OCG size rules; Extra Deck contents and stats (Number C104 3000 ATK, Number 99 3000 ATK)
• Observed: Usage stats: Mulcharmy Fuwalos 85 percent and Ash Blossom 81 percent inclusion among archetype decks
• Inferred: P(at least one starter) about 0.78 from hypergeometric estimates; Hand-trap and interaction value from card text; Combo ceiling and floor from text only
• Provisional: Meta Power: no dated metagame sample; Matchup fit: no tournament link
• 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, going-second and matchup rates unknown no Side Deck in the export: D12 cannot be measured Meta Power is Provisional unless a dated metagame sample is supplied