Melffy Deck #759960 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

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

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

Legality

Main 40 / Extra 15 / Side 0 — status under the rules at evaluation time: Illegal. 5 violation(s).

Identity & game plan

• Win condition: Melffy Extra Deck boss monsters (Melffy Mommy / Godmommy / Merry Melffys / Melffys' Joyful Surprise) built from Melffy Beast-type monsters, with Stardust and ZEUS as closers; Tri-Brigade Link monsters (Shuraig, Ferrijit, Bearbrumm) as a second Extra Deck line
• Turn 1 (going first): Open a Melffy Level 2 starter (Rabbys, Puppy, Wally, Catty or Pinny), search or summon a second Beast, then Xyz or Synchro into a Melffy boss
• Turn 2 (going second): Use the Melffy monsters' return-to-hand effects and Ash Blossom / Droll as hand traps to interrupt the opponent's summon, then rebuild a board from the Deck
• Recovery: Melffy Footsteps and Melffy Catty-style searches plus Melffy Mommy's material-transfer effects to rebuild after an interruption (text-based, not tested)
• After siding: No Side Deck is registered, so no post-side plan exists in this list

Why it scores here

This list is scored as a system, not as an average of its cards, and it is illegal in OCG, so the score is capped and is structural-only. It reliably opens a Level 2 Beast starter, with P(at least one of three-copy starters in a 5-card hand) about 0.34 per card and a core-group opening probability of about 0.69 (Inferred). Its strength is Melffy's return-to-hand interruptions and a 12-card negation text package, which give layered interaction on the opponent's turn. The deck has no recorded boards, no tournament link and no Side Deck, so combo ceiling, median output, post-side and matchup fit stay Inferred or Provisional. Popularity (Melffy as an established archetype) did not earn points, and the illegal copy counts plus three Forbidden cards cost it the normal Final score.

Dimension scores

How the score was computed

Strategy profile: Midrange. Structural ≈ 51.5, Going First ≈ 50, Going Second ≈ 48, Meta = provisional, Tournament Reliability ≈ 45. Modifiers: banlist exposure (-12); illegal_legality_cap (-8). Final formula: Structural 51.5 -> 0.80*51.5 + 0.20*45 = 50.2; banlist exposure modifier -12 -> 38.2; Illegal legality cap -> 30 (theoretical/structural only). Meta Power provisional/null.

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.34 · 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

• Layered return-to-hand interruptions on the opponent's summons (Melffy Puppy, Wally, Rabbys, Catty, Pinny)
• Twelve negation-text cards and five hand traps for interaction on the opponent's turn
• High-ATK Extra Deck closers (Stardust Dragon, Satellite Warrior, ZEUS 3000 ATK, Shuraig 3000 ATK)

Weaknesses

• Illegal list: three Forbidden cards and two over-limit Limited/Semi-Limited cards
• No Side Deck, so no post-side adaptation
• Large off-archetype share (32 of 55 copies are not exact Melffy) lowers engine coherence
• No recorded boards, so the combo ceiling and median are unmeasured

Critical choke points

• Melffy Level 2 starter access: each 3-copy starter has only about a 0.34 chance of appearing in a 5-card hand (Inferred)
• Forbidden and over-limit cards must be removed before the deck can be played in OCG

Recommended changes

Evidence & confidence

• Verified: Legality: Illegal; violations and banlist statuses listed in the evidence; Composition: 40 Main, 15 Extra, 0 Side; 41.8% exact Melffy purity; Card text and stats for the Melffy, Tri-Brigade and Stardust cards
• Observed: Usage statistics: Melffy core cards at 100% inclusion; 5 of 25 core cards present
• Inferred: Starter access and brick risk from hypergeometric estimates; Interaction density from negation and hand-trap text; Going-first and going-second splits from hand-trap and starter probabilities
• Provisional: Meta Power; Matchup fit (D13); Post-side plan (D12)
• Data gaps: No combos supplied: combo floor, median and ceiling are text-only inference No tournament link: archetype meta-share and per-pilot match record absent No win-rate telemetry: going-first, going-second, matchup and brick rates are Inferred or Unknown No Side Deck registered, so post-side adaptability cannot be measured Meta Power is Provisional unless a dated metagame sample is supplied