Umbral Horror Deck #770935 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

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

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

Legality

Main 40 / Extra 15 / Side 0 — status under the rules at evaluation time: Illegal. 1 violation(s).

Identity & game plan

• Win condition: Xyz boss pressure from Extra Deck Umbral Horror / Number Xyz monsters (Number C104, Number 104: Masquerade V, Number 39 family) built through Level 4 monster chains; Hand-trap-supported board breaking and negation of opponent starters, then converting with 2800-3100 ATK Xyz monsters
• Turn 1 (going first): Open a Level 4 starter (Thousand, Shining, V, Gorgonic, Mulcharmy, or Upstart Goblin for draws), search an Umbral Horror via V or Gorgonic, and Xyz Summon a 3000 ATK Number monster, keeping Ash Blossom and Infinite Impermanence up as hand traps (Inferred)
• Turn 2 (going second): Use Ash Blossom and Barian's Seal as hand traps to strip the opponent's first Spell or Trap or starter, then rebuild the Xyz board from Extra Deck boss monsters (Inferred)
• Recovery: Thousand Umbral Horror and Garbage Golem recur from the GY, Barian's Seventh Untopia and Barian's Hope search Umbral Horror monsters, and Magical Mallet and Upstart Goblin refill the hand (Inferred from card text)
• After siding: Not evaluable: the deck runs no Side Deck, so there is no post-side plan (Verified from composition)

Why it scores here

This list is Illegal in OCG: Ash Blossom & Joyous Spring is run three times against a limit of two, so it is scored only as a theoretical, structural read and its final score is capped at 30. Its consistency is solid on paper: a searcher-heavy Level 4 starter package gives roughly an 82% chance of at least one searcher in an opening five-card hand, and the Umbral Horror core is nearly always present (Inferred from the hypergeometric estimates). Interaction is the deck's strongest structural trait, with five hand traps, seven negation-text cards and nine removal-text cards, so it can disrupt opposing starters and boards. Offensive closing power comes from Extra Deck Xyz bosses at 2700 to 3100 ATK. The deck has no recorded boards, no tournament link and no Side Deck, so combo floor, median output, matchup fit and post-side reliability are all low-confidence. Popularity was not credited, and card scores were not averaged into the deck score.

Dimension scores

How the score was computed

Strategy profile: Midrange primary, no secondary blend applied. Structural ≈ 55, Going First ≈ 58, Going Second ≈ 52, Meta = provisional, Tournament Reliability ≈ 48. Modifiers: Banlist / copy-limit exposure (-8); No Side Deck (-4); Illegal list cap (-12). Final formula: Uncapped: 0.80*Structural(55) + 0.20*TournamentReliability(48) + Modifiers(-12) = 42; Meta provisional; capped to 30 because legality status is Illegal

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.82 · 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

• Deep searcher package for Umbral Horror and Barian's pieces (Inferred)
• Five hand traps and seven negation-text cards give wide interaction (Verified card text)
• Extra Deck bosses at 2700 to 3100 ATK close games (Verified stats)

Weaknesses

• Illegal copy count of Ash Blossom & Joyous Spring (Verified)
• No Side Deck, so no adaptability (Verified)
• Only 18.2% exact-name archetype purity; many off-archetype copies (Verified)
• No recorded boards or tournament data to confirm the plan works (Verified gap)

Critical choke points

• Ash Blossom copy count must be fixed before the list is playable in OCG
• Xyz summons depend on Level 4 monsters remaining on the field after Thousand, Shining and V starters are used (Inferred)

Recommended changes

Evidence & confidence

• Verified: Legality status is Illegal: Ash Blossom run 3 vs legal 2; Main 40, Extra 15, Side 0 counts; Archetype purity 18.2%; Banlist status of all cards; Card text and stats for each card
• Observed: Usage statistics: 8 of 13 core cards present (61.5%)
• Inferred: Opening-hand consistency estimates; Interaction and recursion reads from text; Going-first and going-second plan descriptions; Pilotability estimate
• Provisional: Meta Power (no dated metagame sample); Matchup and format fit (D13); Median combo output (D4), no boards
• Data gaps: No combos supplied; combo floor, median and ceiling are text-only inference No tournament link; archetype meta-share and per-pilot records absent No win-rate telemetry for going-first, going-second, matchups or brick rates No Side Deck present, so post-side plan cannot be evaluated Meta Power is Provisional unless a dated metagame sample is supplied