Umbral Horror Deck #308147 — Yu-Gi-Oh! OCG

Umbral Horror (no title) — Deck Power Evaluation

Final Contextual Deck Power: 32/100 (±8 · Confidence: Low)

• Primary strategy: Toolbox / Grind
• Secondary strategies: Control, Midrange
• Format: ocg

Legality

Main 40 / Extra 14 / Side 0 — status under the rules at evaluation time: Illegal. 4 violation(s).

Identity & game plan

• Win condition: Grind-based attrition and resource advantage through Bystial recursion and negation layering; Beatdown via Darkest Diabolos, Schwarzschild Infinity Dragon, and Level 8 synergies
• Turn 1 (going first): Set up hand traps and a board of Level 8 dragons with light negation; use Bystial effects reactively
• Turn 2 (going second): Leverage hand traps (Ash, Veiler, Maxx C if legal) and Bystial removal to break opponent board; replay Bystials from GY
• Recovery: Banish-to-hand loops via Bystial Magnamhut and Branded Regained; recur Bystial Saronir and Druiswurm from GY
• After siding: No sideboard supplied; cannot evaluate post-side coherence

Why it scores here

This deck is illegal in OCG (running 3 Maxx "C", 2 Called by the Grave, 2 Striker Dragon, and 1 Borreload Savage Dragon over or at forbidden status), so the evaluation is structural and theoretical only. The core strategy—stacking Bystial grinders with hand-trap interference and Level 8 negators—is sound in principle but hampered by inconsistent assembly. The archetype is severely underrepresented (only 20% of the core present), the engine lacks a unified starter (no Mulcharmy Fuwalos, the 100% inclusion anchor), and combos are unparseable. Opening consistency is weak, brick rate is high due to conflicting engine pieces, and the best line is a modest defensive board rather than explosive pressure. Popularity and meta-share did not inform this score; the deck was scored solely on its functional coherence, and that coherence is fragile.

Dimension scores

How the score was computed

Strategy profile: 0.60*Toolbox + 0.40*Control (primary grind/flexibility, secondary negation/stall). Structural ≈ 38, Going First ≈ 42, Going Second ≈ 46, Meta = provisional, Tournament Reliability ≈ 28. Modifiers: Illegality penalty (-18); Archetype misalignment (-6); Unparseable combos (-4). Final formula: 0.75*Structural + 0.25*TournamentReliability (Illegal deck; Meta provisional; capped due to legality violations)

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.34 · key two-card combo ≈ 0.18 · full-brick estimate ≈ 0.38 (all Inferred)
• Combo output: best PowerIndex 42, median 35, board-per-starter 1.4
• Turn order: 0 going-first lines vs 0 going-second lines

Strengths

• Redundant Bystial banish-to-hand sequencing (Magnamhut, Druiswurm, Baldrake, Saronir) creates multiple recovery routes after disruption
• 14 cards with negation or removal text provide layered interaction and grind potential
• Branded Regained draw and Bystial Magnamhut search support resource regeneration across turns
• 9 hand traps (if legalized) enable reactive going-second disruption
• Diverse Extra Deck (Synchro, XYZ, Link) offers flexible summon routes

Weaknesses

• Illegal in current OCG format: 3 Maxx "C" (Forbidden), 2 Called by the Grave (over limit), 2 Striker Dragon (over limit), 1 Borreload Savage (Forbidden)
• 0% archetype-name purity; missing Mulcharmy Fuwalos (100% core inclusion) and Umbral Horror xyz engine; deck is Bystial-Branded hybrid, not true Umbral Horror
• No unified primary starter; Schwarzschild and Darkest Diabolos require specific board conditions (no monsters or 2000+ ATK opponent board)
• High brick rate (~38%) due to conflicting Metalmorph vs. pure Bystial lines and oversaturation of hand traps
• No parseable combos; median output is defensive grind rather than explosive board
• Borreload Savage (Forbidden) appears in Extra Deck, suggesting outdated list or intentional violation
• No sideboard (0 side cards); cannot adapt in best-of-3 format
• Pilotability complexity not validated; Bystial sequencing is intricate and error-prone

Critical choke points

• Legality violations make the deck unplayable in OCG; evaluation is theoretical only
• Lack of Mulcharmy Fuwalos cripples consistency; Umbral Horror core is essentially absent
• Over-reliance on Bystial GY effects; if GY is warded (e.g., macro, imperial order), deck locks
• Borreload Savage (Forbidden) signals either outdated/aspirational build or format confusion
• No side deck removes best-of-3 resilience
• Metalmorph and pure Bystial engines pull in opposite directions; coherence unclear

Recommended changes

Evidence & confidence

• Verified: Deck is Illegal in OCG (4 violations confirmed in legality.violations); Main Deck: 40 cards; Extra Deck: 14 cards; Side Deck: 0 cards; Banlist status of each restricted card (Maxx C Forbidden, Called by Grave Limited, etc.); Archetype purity 0% (no exact-name Umbral Horror cards present); Hand-trap count: 9 (Ash Blossom ×3, Effect Veiler ×3, Maxx C ×3); Negation/removal text present: 14 distinct cards (verified from card excerpts)
• Observed: Archetype composition: Bystial (6 copies, 15%), Branded (2 copies, 5%), Metalmorph (5 copies, 12.5%), Red-Eyes (2 copies), generic tech (remaining); Copy histogram: 8 three-ofs, 3 two-ofs, 10 one-ofs (from composition.copy_histogram); Extra Deck: 6 XYZ, 4 Synchro, 4 Link monsters
• Inferred: P(≥1 primary starter in hand 5) ≈ 0.34; hypergeometric from 3-of and 2-of draw table; Brick rate (no starter, no hand trap, dead Metalmorph hand) estimated ~38%; Best combo output ~42 PowerIndex (Level 8 XYZ + negator + Bystial float); median ~35 PowerIndex; Bystial Dis Pater (Level 10 Synchro) is the primary negation/recovery boss; Branded Regained + Bystial Magnamhut loop supports grind recovery over 2–3 turns; Borreload Savage (Forbidden) was likely a planned ceiling play (Inferred from Extra Deck presence); Metalmorph Red-Eyes engine conflicts with pure Bystial grind strategy; Going-first strength (42/100) slightly exceeds going-second (46/100) due to hand-trap density
• Provisional: Meta Power null; no dated metagame sample supplied; archetype meta-share unknown; Bystial vs. Branded playstyle and sequencing depends on post-side adaptation (no sideboard present); Matchup outcomes unknown without tournament context
• Data gaps: No combo boards; combo data.total combos = 0; combo floor/median/ceiling are text-only Inferred estimates No tournament link; archetype meta-share and per-pilot match record absent No win-rate telemetry (YGOVN does not supply going-first/second win rates, matchup-specific rates, or brick/starter/OTK frequencies) No sideboard (0 side cards); post-side performance and adaptation strategy cannot be evaluated Archetype purity 0%; deck deviates from stated Umbral Horror archetype; true engine identity (Bystial-Branded) unclear Illegal list cannot be evaluated as a playable format deck; evaluation is structural-only No guide snippets or strategic intent documents (guide data.total guides = 0) Borreload Savage (Forbidden, in Extra Deck) raises questions about list currency and intent