Fiendsmith Deck #774245 — Yu-Gi-Oh! Master Duel

Deck — Deck Power Evaluation

Final Contextual Deck Power: 62/100 (±6 · Confidence: Medium)

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

Legality

Main 40 / Extra 15 / Side 0 — status: Legal.

Identity & game plan

• Win condition: Fiendsmith and Evil★Twin end-board bosses (Evil★Twin's Trouble Sunny 3300 ATK, Fiendsmith's Rextremende 3000 ATK, Fiendsmith's Desirae 2800 ATK) reached after the Live☆Twin disruption and summon chain.; Fiendsmith's Lacrima (2400 ATK, -600 ATK to opposing monsters) as a second boss route; Gigantic Spright as a Spright-line Xyz finisher.
• Turn 1 (going first): Open on Live☆Twin Lil-la or Ki-sikil summon chains, use Secret Password or Live☆Twin Sunny's Snitch to find the next engine piece, and keep Ash Blossom, Droll & Lock Bird and Maxx C in hand for the opponent's first summon or search.
• Turn 2 (going second): Hold a six-card hand with 6 hand-trap-type cards (Ash Blossom, Droll & Lock Bird, Maxx C, Ki-sikil Frost and similar) to interrupt the opponent's first search or summon, then use Lil-la Sweet's negation on Live☆Twin activations and Desirae's negation later in the game.
• Recovery: Rebuild from the GY: Lil-la Sweet is Special Summonable from the GY while a Ki-sikil is controlled, Fiendsmith's Tract banishes from the GY to Fusion Summon, Engraver can shuffle a LIGHT Fiend from the GY, and the Mulcharmy monsters draw cards to refill the hand.
• After siding: No side deck is registered (side count 0, legal for Master Duel), so there is no evidenced post-side plan; the post-side score is Inferred from composition alone.

Why it scores here

Scored as a system, not an average of card scores: the 40-card main is legal and tightly packed, with 14 searcher-text cards and 16 archetype-core copies giving about a 93.5% chance of at least one core card in a five-card opening hand (Inferred hypergeometric estimate). Its interaction layer is the strongest part of the list: six hand-trap-type cards, five negation-text cards, and six removal-text cards, which together give it a credible way to slow an opponent's first turn and an end board of 3000-3300 ATK bosses. The deck is labelled Fiendsmith, but exact-name purity is only 21.8% (12 of 55 copies), with Live☆Twin, Spright, Mulcharmy and Evil★Twin filling the rest, so its engine coherence is a real weakness rather than a strength. No combo boards, tournament link, or post-side data exist in the evidence, so the floor, median and ceiling scores are text-only inferences and the Meta Power stays provisional; popularity and the single guide's description of a control plan were not treated as evidence of power.

Dimension scores

How the score was computed

Strategy profile: 70/30, integer-rounded: D1 10, D2 7, D3 5, D4 8, D5 11, D6 13, D7 11, D8 7, D9 5, D10 6, D11 3, D12 5, D13 6, D14 3 (sum 100). Structural ≈ 64.55, Going First ≈ 68, Going Second ≈ 66, Meta = provisional, Tournament Reliability ≈ 60. Modifiers: No side deck (-2); Engine conflicts (-2); Redundant starters (2). Final formula: 0.80*Structural + 0.20*TournamentReliability (Meta provisional); 0.80*64.55 + 0.20*60 = 63.64, then context modifiers -2 = 61.64, rounded to 62

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.9 · key two-card combo ≈ — · full-brick estimate ≈ 0.07 (all Inferred)
• Combo output: best PowerIndex —, median —, board-per-starter —
• Turn order: 0 going-first lines vs 0 going-second lines

Strengths

• Dense interaction: six hand-trap-type cards, five negation-text cards and six removal-text cards
• Redundant starters and searchers: 14 searcher-text cards and about 0.94 chance of an archetype-core card in hand
• Extra Deck bosses at 2800-3300 ATK plus Lacrima's field effect
• Recursion from the GY across several lines

Weaknesses

• Low exact-archetype purity (21.8%) despite the Fiendsmith label, so engines overlap and partly conflict
• No side deck (side 0), so no adaptation plan is evidenced
• Many conditional summon requirements (Lil-la, Ki-sikil, Mulcharmy) raise execution load and brick risk
• Spright Elf, Sprind and Gigantic Spright depend on a thin Spright line

Critical choke points

• Surviving the first summon or search with a hand-trap, since many lines start from Lil-la or Ki-sikil
• The Fiendsmith and Evil★Twin link chain needs a Ki-sikil or Lil-la on board before the bosses can be summoned

Recommended changes

Evidence & confidence

• Verified: Legal in Master Duel: 40 main, 15 extra, 0 side; Maxx C at 1 of 1 Limited copies; Droll & Lock Bird at 2 of 2 Semi-Limited copies; Card text from resolved card excerpts; Archetype usage stats available (12 rows)
• Inferred: Opening-hand probabilities from the hypergeometric model; Hand-trap and negation coverage from card text; Ceiling and median ratings from text only, with no recorded boards; Control strategy label, which matches the guide's description of a control plan
• Provisional: Meta Power (null) and D13 format fit, since no dated metagame sample is supplied; Post-side score, since no side cards are registered
• Data gaps: No combos supplied: combo floor, median and ceiling are text-only inference No tournament link: archetype meta-share and pilot match record are absent No win-rate telemetry for going first/second, matchups, brick rate or starter rate Meta Power is provisional without a dated metagame sample Usage statistics mark Fiendsmith's Lacrima, Sequence and Requiem as absent from this deck (in this deck false, missing core cards), yet the cards list shows all three in the Extra Deck, so the 66.7% core-present figure is unreliable Moon of the Closed Heaven (usage core, 60%) is absent from the cards list No side deck registered, so no post-side evidence