Melffy Deck #757780 — Yu-Gi-Oh! OCG

Deck — Deck Power Evaluation

Final Contextual Deck Power: 54/100 (±8 · Confidence: Medium)

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

Legality

Main 55 / Extra 15 / Side 0 — status: Legal.

Identity & game plan

• Win condition: Melffy board of Beast monsters converted into Xyz (Joyous Melffys, Melffy Mommy, Melffy Godmommy) and Synchro/Fusion pressure, with direct attacks from Joyous Melffys; Stardust and generic Synchro/Xyz bodies (Stardust Dragon, Accel Synchro Stardust Dragon, Satellite Warrior, Divine Arsenal AA-ZEUS) once the board is stable
• Turn 1 (going first): Open with a Melffy Level 2 monster (Melffy Rabbys, Puppy, Wally, Catty, Pinny) or Melffy Footsteps to search, then build a Level 2 Beast Xyz or Synchro; hand traps are largely dead on turn 1 without an opponent Summon
• Turn 2 (going second): Respond to the opponent's first Summon with Melffy Rabbys, Puppy, or Wally, backed by a hand trap (Infinite Impermanence, Ash Blossom, Ghost Belle, Droll) to protect the start, then convert to Xyz/Synchro
• Recovery: Recur Melffy monsters via Melffy Footsteps, Rescue Cat, Melffy Hide-and-Seek and the monsters' return-to-hand effects, and rebuild with Melffy Catty and Pinny as additional Level 2 fodder
• After siding: No side deck is registered, so there is no post-side plan

Why it scores here

The deck opens a functional plan at a moderate rate: roughly 61% of 5-card openings hold at least one of the nine main-deck Melffy Level 2 openers (my hypergeometric estimate, Inferred), and Melffy Footsteps raises that to about 72%. Its strongest score drivers are system-level: 12 traps and 15 hand traps give layered negation that is very likely to be live on the opponent's turn (about 87% of 6-card going-second hands hold at least one hand trap), and the Melffy Level 2 Beast bodies keep several lines alive after one disruption. Its weaknesses are a dead-card burden on going first, a 13-Tuner main deck where only about a third of copies are exact-name Melffy (32.9%), a Rivalry of Warlords and Dimensional Barrier pair that conflicts with the deck's own Beast Xyz, Synchro and Fusion monsters, and no side deck at all. Popularity was not credited: the archetype usage data are inconsistent (see data gaps), no tournament result exists, and the score was not built by averaging individual card scores.

Dimension scores

How the score was computed

Strategy profile: Midrange. Structural ≈ 58.5, Going First ≈ 62, Going Second ≈ 66, Meta = provisional, Tournament Reliability ≈ 50. Modifiers: engine conflicts (-2); banlist exposure (-1). Final formula: 0.80*Structural + 0.20*TournamentReliability (Meta provisional) + ContextModifiers = 0.80*58.5 + 0.20*50 - 3 ≈ 54

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.61 · 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 negation: 15 hand traps plus 12 traps; about 87% of going-second 6-card hands hold a hand trap
• Several Melffy Level 2 Beast openers that return to hand and re-summon, giving independent lines after disruption
• Full, flexible Extra Deck with a Melffy Xyz core and generic Synchro backup

Weaknesses

• Heavy dead-card burden on going first (hand traps need an opponent Summon)
• Only about 33% exact-name Melffy; much of the list is generic tech and hand traps
• Rivalry of Warlords and Dimensional Barrier conflict with the deck's own Beast Xyz, Synchro and Fusion monsters
• Melffy Rabby is a vanilla Normal Monster in the evidence, so it adds no engine value
• No side deck: no post-side adaptation

Critical choke points

• Melffy Rabbys (3 copies) and the Melffy Level 2 openers: the going-first starter depends on drawing one of about 9 cards
• Melffy Footsteps as the only search-to-hand for the engine

Recommended changes

Evidence & confidence

• Verified: Legal OCG list: 55 Main, 15 Extra, 0 Side; all Limited/Semi-Limited copy counts at legal limits; Hand-trap and Melffy-opener counts from the copy table; Extra Deck breakdown: 7 Xyz, 6 Synchro, 2 Fusion
• Inferred: Hypergeometric openings: 0.61 (9 Melffy openers), 0.72 (with Footsteps), per-card 0.2529 and 0.8676 from evidence; Strategy classification as Midrange with Stun secondary; Interaction and resilience reads from card text
• Provisional: Meta Power (null) and matchup fit (D13) pending a dated metagame sample
• Data gaps: No combos supplied: combo floor, median and ceiling are text-only inference No tournament link: archetype meta-share and pilot match record absent No win-rate telemetry (going-first/second, matchup, brick/starter rates) Archetype usage data is internally inconsistent: Melffy of the Forest, Melffy Godmommy, Melffy Mommy, Joyous Melffys, Merry Melffys, Stardust Dragon, Accel Synchro, Satellite Warrior, Desert Locusts, Divine Arsenal and Melffys' Joyful Surprise appear in this deck's Extra Deck but are marked in_this_deck=false. The core_present_pct of 20% therefore understates the true figure: 16 of 25 core cards are present by name (~64%) Side deck absent (side 0)