Umbral Horror Deck #772661 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

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

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

Legality

Main 55 / Extra 15 / Side 0 — status under the rules at evaluation time: Illegal. 2 violation(s).

Identity & game plan

• Win condition: Xyz and Link boards (K9-X Werewolf, Number C104 Masquerade Victory, Divine Arsenal AA-ZEUS, Red-Eyes Black Dragon Exceed) built from Dark Time Wizard, K9 and Masquerade lines, with a Toolbox hand-trap shell protecting the summon.; Direct and piercing pressure from high-ATK Xyz monsters once the opponent's Spell/Trap interaction is removed by Harpie's Feather Duster, Lightning Storm or Jinzo.
• Turn 1 (going first): Open with a searcher (Dark Time Wizard, Alligator's Dragon Knight, K9-66b Lantern or A Case for K9) to reach a live K9 or Dark Time Wizard board, then hold Ash Blossom and Infinite Impermanence for the first response.
• Turn 2 (going second): Use the six-card hand's 16 hand traps (about 89% to hold at least one) to answer the opponent's first summon or activation, then convert the surviving hand into an Xyz or Link board.
• Recovery: Mulcharmy Fuwalos and Mulcharmy Purulia draw when the opponent summons, Foolish Graverobber and Reversal Box recur Dark Time Wizard pieces, and K9-X Forced Release resets the Xyz line.
• After siding: Not supported: the deck runs zero Side Deck cards, so there is no post-side plan.

Why it scores here

The list is illegal as submitted: Ash Blossom & Joyous Spring and K9-17 Izuna each run 3 copies against an OCG limit of 2, so the normal Final Contextual score is capped and this result is theoretical and structural only. Structurally, the deck has a strong interaction shell (16 hand traps, Harpie's Feather Duster, Lightning Storm, Solemn Judgment, Jinzo) and several high-ATK Xyz closers, which earns the interaction and board-breaking dimensions. Its engine accessibility is weak: the Umbral Horror name matches none of the 70 archetype-tagged copies (0% exact-name purity), the copies are spread across about 15 sub-archetypes (Dark Time Wizard, K9, Mulcharmy, Masquerade and others), and the archetype core group is only about 61% likely to appear in an opening five. The deck runs no Side Deck, so best-of-three adaptation scores near the floor. No combos, guides or tournament results were supplied, so the score does not rest on popularity or on an average of card scores.

Dimension scores

How the score was computed

Strategy profile: Toolbox. Structural ≈ 49.6, Going First ≈ 48, Going Second ≈ 55, Meta = provisional, Tournament Reliability ≈ 38. Modifiers: Copy-limit violation (illegal list) (-6); Engine conflict (-4); No side deck (-2). Final formula: 0.80*Structural(49.6) + 0.20*TournamentReliability(38) = 47.2, then ContextModifiers (-12) = 35.2, rounded to 35; illegal-list cap applied, theoretical/structural only (Meta provisional)

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.25 · 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 interaction package: 16 hand traps plus Solemn Judgment, Harpie's Feather Duster, Lightning Storm and Jinzo.
• High-ATK Xyz and Link closers (K9-X Werewolf 3300 ATK, Masquerade Victory 3000 ATK, Divine Arsenal AA-ZEUS 3000 ATK).
• Recursion and draw routes (Mulcharmy, Foolish Graverobber, Reversal Box) regenerate resources.

Weaknesses

• Illegal copy counts on two Semi-Limited cards.
• No Side Deck, so no post-side plan.
• Low archetype coherence: 0% exact-name purity and roughly 15 sub-archetypes.
• High brick risk from 16 hand traps and conditional engines that need specific board states.

Critical choke points

• Summoning a K9 or Masquerade Xyz depends on a single Dark Time Wizard or K9 searcher being in hand.
• Mulcharmy lines require an empty field, which conflicts with Xyz and Link boards.

Recommended changes

Evidence & confidence

• Verified: Legality: Illegal; Ash Blossom & Joyous Spring and K9-17 Izuna each run 3 copies against an OCG limit of 2.; Main 55 / Extra 15 / Side 0, all within the OCG size rules.; Zero Side Deck cards.; Usage stats available: 3 of 13 core cards present (23.1%).
• Inferred: Opening-hand probabilities for the core group, searchers and hand traps (hypergeometric, recomputed).; Engine conflict across Dark Time Wizard, K9, Mulcharmy and Masquerade lines.; Interaction density and board-breaking read from card text.
• Provisional: Meta Power is null; no dated metagame sample.; Matchup fit (D13) is a neutral placeholder.
• Data gaps: No combos supplied, so floor, median and ceiling are text-only inference. No tournament link, so archetype meta-share and pilot record are absent. No win-rate telemetry for going-first, going-second, matchups or brick rates. Meta Power is provisional without a dated metagame sample. Usage-stat matching is by reference id; 'Number C104: Umbral Horror Masquerade' (ref 49456901) is not in the deck, while the deck runs 'Number C104: Umbral Horror Masquerade Victory' (42396591), which may or may not be the same card.