Megalith Deck #773394 — Yu-Gi-Oh! Master Duel

Deck — Deck Power Evaluation

Final Contextual Deck Power: 56/100 (±8 · Confidence: Medium)

• Primary strategy: Combo
• Secondary strategies: Midrange, Toolbox
• Format: master-duel

Legality

Main 42 / Extra 15 / Side 0 — status: Legal.

Identity & game plan

• Win condition: Ritual Summon Megalith or Mitsurugi Ritual Monsters (Notrah Plura 3700 ATK, Ame no Murakumo no Mitsurugi 3200 ATK, Futsu no Mitama no Mitsurugi) by chaining Ritual Spells and Tributes, then converting the board with Synchro, Link and Xyz Extra Deck monsters; Ame no Murakumo no Mitsurugi's Special Summon effect destroys the opponent's monsters; Ame no Habakiri no Mitsurugi reduces opposing monsters' ATK by 800
• Turn 1 (going first): Turn 1 searcher chain (Pre-Preparation of Rites, Manju, Mitsurugi/Megalith monsters that add a card to hand) into a Ritual Summon of a Ritual Monster, then Extra Deck extension with the remaining Extra Deck monsters
• Turn 2 (going second): Open with one of the 3 hand traps (Droll & Lock Bird, Maxx C, Mitsurugi Great Purification) or a Ritual Monster line to answer the opponent's first board, then continue the ritual engine on the next turn
• Recovery: Ritual Monsters recur from the GY through Pre-Preparation of Rites, Mitsurugi Prayers, Megalith Phul and Mitsurugi Mirror; Megalith Anastasis adds two monsters from the Deck
• After siding: No Side Deck is registered, so there is no post-side plan; the deck cannot adjust between games in a best-of-3 set

Why it scores here

The deck reliably opens its engine: 23 searcher-text cards and 3-copy starters give about a 32% chance of a 3-copy starter in a 5-card going-first hand, and the archetype core is present in about 99% of opening hands (Inferred from hypergeometric estimates). Its ceiling comes from text: Notrah Plura, Ame no Murakumo no Mitsurugi and the negation/removal effects give it real board impact, but no recorded boards exist, so the median is a low-confidence estimate. Interaction is broad (three hand traps, Mitsurugi Great Purification, Crossout Designator, and several negation text effects), which supports the endboard score. The score does not come from Megalith being a popular archetype, and it does not average the individual card scores. Deductions come from a split Megalith and Mitsurugi engine (exact-name purity 24.6%), a zero-card Side Deck, and a complex multi-step ritual line.

Dimension scores

How the score was computed

Strategy profile: Combo. Structural ≈ 62, Going First ≈ 60, Going Second ≈ 52, Meta = provisional, Tournament Reliability ≈ 55. Modifiers: engine split (-3); no side deck (-2). Final formula: 0.80*Structural + 0.20*TournamentReliability + ContextModifiers (Meta provisional): 0.80*62 + 0.20*55 = 60.6; modifiers -5 gives 55.6, rounded to 56

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.32 · 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

• 23 searcher-text cards make the ritual engine reliable on the first turns
• Layered interaction: 3 hand traps, Great Purification, Crossout Designator and several negation effects
• High-ATK ritual endboard (Notrah Plura 3700, Murakumo 3200) with Habakiri's ATK reduction
• Recursion of Ritual Monsters from the GY through several routes

Weaknesses

• Engine is split between Megalith and Mitsurugi (exact-name purity 24.6%)
• No Side Deck (0 cards) gives no post-side plan in best-of-3
• Ritual Summons depend on Tribute totals, which makes each turn a multi-step decision tree
• Ten core cards from the archetype usage stats are absent, including several Extra Deck monsters

Critical choke points

• Ritual Spell and matching Ritual Monster must both be in hand or reachable; Pre-Preparation of Rites x3 and Manju x3 are the main searchers
• Hand-trap coverage on going second depends on 3 cards in 6 draws (37.8%)

Recommended changes

Evidence & confidence

• Verified: Legal in master-duel: 42 Main, 15 Extra, 0 Side; no violations; Limited cards run at 1 copy and Semi-Limited at 2, both within legal copies; Card texts of Notrah Plura, Ame no Murakumo no Mitsurugi, Droll & Lock Bird, Maxx C and Crossout Designator; Exact-name archetype purity 24.6%; 15 of 25 usage-stat core cards present
• Observed: Usage statistics: 30 archetype stat rows, 15 of 25 core cards present
• Inferred: Starter and archetype-core hypergeometric odds; Hand-trap coverage on going second; Pilotability from ritual step count; Interaction quality from text (not from recorded boards)
• Provisional: Median combo output, going-first and going-second splits; Matchup and format fit (no tournament context); Meta Power (null)
• 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, going-second and matchup rates unknown Meta Power is Provisional without a dated metagame sample Deck has no title (deck_name null)