Crystal Beast Deck #772331 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

Final Contextual Deck Power: 25/100 (±8 · Confidence: Low)

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

Legality

Main 40 / Extra 15 / Side 0 — status under the rules at evaluation time: Illegal. 8 violation(s).

Identity & game plan

• Win condition: Ultimate Crystal Fusion boss (Rainbow Dragon / Rainbow Overdragon, 4000 ATK) summoned after 7 different-name Crystal Beast cards are on field or in GY; Link and Xyz pressure from the Extra Deck (Worldsea Dragon Zealantis, Black Luster Soldier - Soldier of Chaos, Ultimate Crystal Rainbow Dragon Overdrive)
• Turn 1 (going first): Crystal Bond or Rainbow Bridge to search a Crystal Beast or Crystal Spell/Trap, Crystal Beacon or Sapphire Pegasus to build Spell & Trap Zone Continuous Spells, then Rainbow Bridge of the Heart for an extra Normal Summon toward the Ultimate Crystal condition (text-derived; Inferred)
• Turn 2 (going second): No dedicated going-second plan evidenced; the Forbidden disruption (Called by the Grave, Triple Tactics Talent, Forbidden Droplet) cannot be legally run as built
• Recovery: Crystal Beast monsters return to hand, Deck or Spell & Trap Zone as Continuous Spells on destruction (Cobalt Eagle, Emerald Tortoise, Amber Mammoth, Topaz Tiger); Rainbow Dragon Crystal recursion (Inferred from text)
• After siding: Not available: the deck has 0 Side Deck cards

Why it scores here

As built the deck is structurally illegal in OCG: eight Forbidden cards are run in excess of their legal copies of zero, so the score is capped and the evaluation is theoretical and structural only. Within that frame the Crystal Beast core is consistent, with a 93.5% (Inferred) chance that at least one of the 16 archetype-core cards is in a 5-card opening hand, backed by 15 searcher-text cards and a Continuous Spell recursion loop that keeps the engine alive after single-card removal. The win condition is the 7-different-names Ultimate Crystal summon, which is powerful when reached but has no recorded combo boards, so floor and median output cannot be measured and are scored as text-only inference. Going second is weak: the Forbidden interaction that would supply it cannot be run legally, and the deck has no Side Deck. Popularity and archetype usage stats (6 of 6 core cards present) confirm the list is real and accessible, but they did not earn points; the dimension scores were not an average of card scores.

Dimension scores

How the score was computed

Strategy profile: Midrange 100% (Combo secondary noted, not blended). Structural ≈ 54.5, Going First ≈ 58, Going Second ≈ 42, Meta = provisional, Tournament Reliability ≈ 45. Modifiers: banlist_exposure_illegal (-10); no Side Deck (-2). Final formula: No reliable metagame: 0.80*Structural + 0.20*TournamentReliability + modifiers = 0.80*54.5 + 0.20*45 - 12 = 40.6; Illegal cap applied, final score set to 25 (theoretical/structural-only)

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.94 · key two-card combo ≈ — · full-brick estimate ≈ 0.06 (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 (16 copies) gives a near-certain engine starter in the opening hand (Inferred)
• Continuous Spell recursion and multiple searchers give redundancy after single-card removal (Inferred)
• Multiple 4000 ATK closing bosses with a Fusion condition that rewards the Spell Zone build (Verified text)

Weaknesses

• Illegal in OCG: eight Forbidden cards over the limit (Verified)
• No Side Deck, so no post-side plan and no adaptation (Verified)
• Only 36.4% exact archetype purity and 23 distinct Main Deck cards, which raises brick and conflict risk (Verified composition)
• Forbidden interaction that supplies going-second strength cannot be run legally (Verified)

Critical choke points

• Reaching 7 different-name Crystal Beast cards for the Ultimate Crystal summon (Inferred)
• Continuous Spell Zone capacity and Crystal Beast placement (Inferred)

Recommended changes

Evidence & confidence

• Verified: Eight Forbidden cards over the legal copy limit of 0 (OCG BanList); Main 40, Extra 15, Side 0, all within size_rules; Archetype core: 16 copies, 6 of 6 usage core cards present; Current card text for the Ultimate Crystal and Crystal Beast cards listed in cards[]
• Observed: Usage statistics show 6 core cards at 50-75% inclusion (Observed from usage statistics)
• Inferred: 16-copy archetype core gives 93.5% (hypergeometric) chance of a starter in hand; Brick and conflict rates from composition and card text; Engine recovery through Continuous Spell recursion
• Provisional: Meta Power is null: no dated metagame sample; Matchup fit and tournament reliability
• Data gaps: no combos supplied: combo floor, median and ceiling are text-only inference no tournament link: archetype meta-share and per-pilot record absent no win-rate telemetry: going-first/second, matchup, brick and OTK rates are Inferred or Unknown Meta Power is Provisional unless a dated metagame sample is supplied Deck has no title and no Side Deck