Umbral Horror Deck #768853 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

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

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

Legality

Main 50 / Extra 15 / Side 0 — status: Illegal. 2 violation(s).

Identity & game plan

• Win condition: Xyz boss monsters from the Extra Deck (Number C104 Umbral Horror Masquerade 3000 ATK, K9-X Werewolf 3300 ATK, Number 69 Dark Matter Demolition 3100 ATK) reached through the Masquerade, K9 and Heraldry Xyz lines; Mulcharmy draw-engine pressure and Heraldic Beast Xyz chains
• Turn 1 (going first): Barian's Seventh Untopia and Thousand/V Umbral Horror searches into an Xyz Summon; Gorgonic and Heraldic Gryphon as non-Extra-Deck starters (Inferred from card text)
• Turn 2 (going second): Ash Blossom and Droll & Lock Bird as hand interaction, then Mulcharmy draws and Xyz recovery through Masquerade / K9 effects (Inferred from card text)
• Recovery: Mulcharmy Fuwalos and Purulia draw on opponent summons; Heraldic Beast Stad Whale and Gorgonic recycle Umbral Horror and Heraldic monsters from Deck and GY (Inferred)
• After siding: None: the list has zero Side Deck cards, so no post-side plan exists in the evidence

Why it scores here

This list is Illegal: Ash Blossom and K9-17 Izuna are each run three times against a limit of two, so under the rubric it is capped and labelled theoretical/structural-only. Its Structural value (about 54, Combo profile) comes from the system, not from averaging card scores: the Extra Deck holds 15 Xyz monsters across several sub-archetypes (Masquerade, K9, Heraldry, Number), so the engine has redundancy but also conflicts. Self-restrictions on Extra Deck Special Summons (Gorgonic Umbral Horror, Heraldic Beast Gryphon, Charged-Up Heraldry) and the two-per-turn cap from Barian's Seventh Untopia (which applies to both players) fight against the Xyz plan. Exact-name archetype purity is only 12.3% with 57 off-archetype copies, and the deck has no Side Deck, so adaptability is very low. Popularity (Mulcharmy Fuwalos at 85% inclusion) confirms that the list is real and accessible, but it earned no power points. No recorded combos, win rates or tournament data exist, so the floor, median and ceiling are text-based inferences and the final score carries a wide band.

Dimension scores

How the score was computed

Strategy profile: Combo. Structural ≈ 54, Going First ≈ 50, Going Second ≈ 56, Meta = provisional, Tournament Reliability ≈ 35. Modifiers: banlist_exposure (-6); engine_conflicts (-4). Final formula: Raw = 0.80*Structural(54) + 0.20*TournamentReliability(35) + context modifiers(-10) = 40; Illegal cap applied -> 30. Meta Provisional.

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.94 · 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

• Two Xyz engines (Masquerade/Number C104 and K9) give several 2800-3300 ATK boss options
• Redundant searchers (21 searcher-text cards) and Mulcharmy draws support consistency
• Four hand traps and multiple negate and destroy effects give layered interaction

Weaknesses

• Illegal: two cards exceed their copy limit
• Zero Side Deck cards, so no post-side plan
• Low archetype purity (12.3%) with 57 off-archetype copies and many sub-archetypes
• Extra Deck self-restrictions conflict with the Xyz plan

Critical choke points

• Extra Deck access: most lines need a specific Xyz from the 15 in the Extra Deck, and self-restrictions can block summons
• Hand interaction depends on Ash Blossom, which is over the copy limit

Recommended changes

Evidence & confidence

• Verified: Legality: Illegal, Ash Blossom and K9-17 Izuna over copy limit (3 vs 2); Main 50, Extra 15, Side 0; within size rules; Banlist statuses for Limited and Semi-Limited cards as listed; Composition counts: 12 triple and 14 single Main Deck cards; 14 distinct Extra Deck cards with 2 copies of Masquerade V; Card text from description excerpts
• Observed: Usage stats: Mulcharmy Fuwalos 85% and Ash Blossom 81% inclusion in the archetype
• Inferred: Hypergeometric draw odds; Going-first and going-second splits; Engine access and brick estimates; Combo ceiling and floor from text only
• Provisional: Meta power and matchup fit: no dated metagame sample or tournament link
• Data gaps: No combos supplied: floor, median and ceiling are text-only inference No tournament link: archetype meta-share and match record absent No win-rate telemetry (going-first/second, matchup, brick and starter rates) Usage core flags conflict with the card list: Number C104 Umbral Horror Masquerade, Number 104 Masquerade, CXyz Hope Chaos Barian Dragon and Number 104 Masquerade V are listed as in_this_deck=false but appear in cards with copies 1-2, so core_present_pct (46.2) is unreliable Meta Power is Provisional without a dated metagame sample