Umbral Horror Deck #767671 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

Final Contextual Deck Power: 30/100 (±10 · Confidence: Low)

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

Legality

Main 55 / Extra 15 / Side 0 — status: Illegal. 3 violation(s).

Identity & game plan

• Win condition: Xyz Summon Number/Masquerade monsters (Number 104: Masquerade V, Number C104) from the Extra Deck, supported by Umbral Horror and Barian's searchers and recursion; K9-17 Ripper / Vallon / Utopia pressure once a board is established
• Turn 1 (going first): Open an Umbral Horror starter (V, Gorgonic, or Thousand Umbral Horror) and search or summon a second Umbral Horror, then build an Xyz toward a Masquerade monster while holding Ash Blossom and Infinite Impermanence up
• Turn 2 (going second): Hold hand traps (Ash Blossom, Ghost Belle, Ghost Ogre, Droll & Lock Bird, Nibiru) against the opponent's first summons and rebuild through Shining Umbral Horror and Barian's Seventh Untopia
• Recovery: Recover through Shining Umbral Horror, Mulcharmy draw effects, and Barian's Seal or Masquerade effects to rebuild Xyz material
• After siding: Not evaluable: the deck runs no side deck (side_count 0), so there is no post-side plan

Why it scores here

The deck reliably opens a functional Umbral Horror starter about 92% of the time across its 21 archetype-core copies (Inferred from the hypergeometric proxy), and its 13 hand traps give it an 82% chance of at least one going second, which lifts interaction and going-second scores. Its ceiling is credible on text alone (Masquerade and Number Xyz routes), but no recorded boards exist, so combo conversion and median output stay near the middle and are Inferred. The deck runs no side deck and its main deck mixes several sub-archetypes (exact-name purity about 13%), which drags efficiency, adaptability and pilotability down. The score is capped at 30 because three cards exceed their copy limits (Seventh Tachyon, Ash Blossom & Joyous Spring, K9-17 Izuna), so this is a theoretical, structural-only read. Popularity and archetype usage stats confirm the list is real, but they did not add points, and card scores were not averaged.

Dimension scores

How the score was computed

Strategy profile: Combo. Structural ≈ 55, Going First ≈ 54, Going Second ≈ 58, Meta = provisional, Tournament Reliability ≈ 40. Modifiers: banlist_exposure (-8); illegal_cap (-14). Final formula: 0.80*Structural + 0.20*TournamentReliability + ContextModifiers (Meta provisional). Uncapped result ≈ 0.80*54.6 + 0.20*40 - 8 ≈ 44; capped to 30 because the deck is Illegal (copy-limit violations), so this is a theoretical, structural-only score

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.92 · key two-card combo ≈ — · full-brick estimate ≈ 0.08 (all Inferred)
• Combo output: best PowerIndex —, median —, board-per-starter —
• Turn order: 0 going-first lines vs 0 going-second lines

Strengths

• Archetype core is dense (21 copies) and opens about 92% of the time
• 13 hand traps give strong going-second interaction (about 82% at least one in 6 cards)
• Multiple Xyz finishers (Masquerade V, Number C104, Vallon, Utopia) give closing pressure

Weaknesses

• Illegal copy limits on three key cards (Seventh Tachyon 3/1, Ash Blossom 3/2, K9-17 Izuna 3/2)
• No side deck, so no post-side adaptation
• Low exact-name purity (about 13%) across mixed Umbral Horror, Mulcharmy, Barian's, K9, Seventh and Number sub-archetypes

Critical choke points

• Seventh Tachyon, Ash Blossom and K9-17 Izuna must be cut to legal limits before the list is playable
• Masquerade and Number Xyz lines need Umbral Horror starters in hand, so a starter-light opening stalls the engine

Recommended changes

Evidence & confidence

• Verified: Main 55, Extra 15, Side 0 counts and copy-limit violations (Seventh Tachyon, Ash Blossom, K9-17 Izuna); Card text and stats for the Umbral Horror, Masquerade and Number cards; Archetype core usage statistics (21 core copies)
• Inferred: Starter access about 0.92 (hypergeometric); Brick rate about 0.08 and going-second hand-trap coverage about 0.82; Interaction quality and the ceiling read from text
• Provisional: Meta Power (no dated metagame sample); Matchup and format fit (no tournament link)
• 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 — going-first/second, matchup, starter and brick rates are Inferred or Unknown deck title is null no side deck supplied (side_count 0) Meta Power is Provisional unless a dated metagame sample is supplied