Umbral Horror Deck #770666 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

Final Contextual Deck Power: 25/100 (±10 · Confidence: Low)

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

Legality

Main 40 / Extra 15 / Side 0 — status under the rules at evaluation time: Illegal. 2 violation(s).

Identity & game plan

• Win condition: Xyz pressure from Number C104: Umbral Horror Masquerade and Number 104: Masquerade (3000 and 2700 ATK) built off the Umbral Horror and Masquerade engine (Inferred from card text); Heraldry and Number Xyz boss monsters (Number 69 Dark Matter Demolition 3100 ATK, Number 69 Shatter Stream 2800 ATK) as follow-up threats
• Turn 1 (going first): Open a starter (Thousand Umbral Horror, V Umbral Horror, Gorgonic Umbral Horror, or Barian's Seventh Untopia), search an Umbral Horror, and reach a Rank 4 or 5 Xyz while holding Ash Blossom or Infinite Impermanence for the opponent's first interaction (Inferred)
• Turn 2 (going second): Hold Ash Blossom, Droll and Lock Bird, Infinite Impermanence and Garbage Golem in hand to interrupt the opponent's first board, then build a Masquerade Xyz through Shining Umbral Horror or Barian's Seal (Inferred)
• Recovery: Recycle monsters from the GY through Dodododo Warrior, Onomatokage and Dodododwarf Gogogoglove, and re-enter the Xyz engine with Masquerade effects that add Barian's cards back (Inferred)
• After siding: No side deck is registered, so no post-side plan exists in this list

Why it scores here

The deck's power is scored on the system, not on an average of its cards. Its archetype core is well represented (P(at least one core card in an opening 5) is about 0.98 by the evidence proxy, Inferred), so the engine usually goes live on turns 1 and 2. Its interaction suite (7 hand traps, 9 negation-text and 13 removal-text cards) gives it strong end-board and going-second strength, which pushes D7 and D8 above the middle. The combo ceiling and median are weak because the evidence has no recorded boards, so D3 and D4 are text-based estimates only. Popularity from the archetype usage statistics confirms the list is real, but it earned no points by itself. The score is capped low because the list is illegal: three Seventh Tachyon exceed the OCG limit of 1 and three Ash Blossom exceed the Semi-Limited limit of 2, and the deck has no Side Deck.

Dimension scores

How the score was computed

Strategy profile: Midrange primary; Stun is recorded as secondary but not blended into the weights. Structural ≈ 55, Going First ≈ 52, Going Second ≈ 62, Meta = provisional, Tournament Reliability ≈ 42. Modifiers: banlist exposure (-8); no side deck (-4); illegal list cap (0). Final formula: 0.80*Structural + 0.20*TournamentReliability + ContextModifiers = 0.80*55 + 0.20*42 - 12 = about 40 uncapped; the Illegal cap sets the final score to 25 (theoretical/structural only). Meta Power is null (provisional).

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.92 · 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

• High archetype core density gives a reliable opening engine (Inferred)
• Dense hand-trap and negation package for going-second interaction (Inferred)
• Multiple Xyz boss options at 2700 to 3100 ATK (Verified stats)

Weaknesses

• Illegal as built: Seventh Tachyon at 3 copies (limit 1) and Ash Blossom at 3 copies (Semi-Limited limit 2) (Verified)
• No Side Deck (Verified)
• Only 16.4 percent exact-name archetype purity, so the engine is split across sub-archetypes (Inferred)
• No combo or tournament evidence, so the ceiling and median are unverified (Provisional)

Critical choke points

• The Masquerade Xyz lines need a Level 4 or 5 Xyz base on the field, so Ash Blossom and Infinite Impermanence interaction can stop the engine early (Inferred)
• Seventh Tachyon needs a Number 101 to 107 Xyz in the Extra Deck, which the deck runs only through Number C104 (Verified card text, Inferred coverage)

Recommended changes

Evidence & confidence

• Verified: Main Deck size 40, Extra Deck size 15, Side Deck size 0 (legal size range); Seventh Tachyon 3 copies over the OCG limit of 1; Ash Blossom 3 copies over the Semi-Limited limit of 2; Archetype usage shows Umbral Horror core cards at 50 to 81 percent inclusion
• Observed: No observed combo boards are available (combos_evidence.total_combos = 0)
• Inferred: Consistency: P(at least one core starter in opening 5) about 0.98 (archetype core group); Interaction density from 7 hand traps and 22 negation or removal text cards; Going-second strength from P(at least one hand trap in 6 cards) about 0.71; Strategy classification as Midrange with Stun and Combo secondary
• Provisional: Meta Power is null: no dated meta sample supplied; Matchup and format fit: no tournament link
• Data gaps: no combos supplied, so the combo floor, median and ceiling are text-only inference no tournament link, so archetype meta-share and per-pilot match record are absent no win-rate telemetry, so going-first, going-second and matchup results are unknown Meta Power is provisional without a dated metagame sample