K9 Deck #766465 — Yu-Gi-Oh! Master Duel

Deck — Deck Power Evaluation

Final Contextual Deck Power: 57/100 (±7 · Confidence: Medium)

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

Legality

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

Identity & game plan

• Win condition: Xyz pressure from K9-X Werewolf (3300 ATK) and K9-X Ripper/M (3100 ATK, piercing), supported by Number C104 and K9-66X Jacks; Number 104 and Number C106 board control with Xyz material stacking, plus Infinitrack River Stormer as a reach threat
• Turn 1 (going first): Open on K9 Normal Summons (no tribute when the opponent holds 2+ cards), Special Summon a second K9 from the Deck via Izuna or Noroi, and reach a Level 5 Xyz with Lantern or Jokul pairs
• Turn 2 (going second): Hold Ash Blossom, Ghost Ogre, Droll and Maxx C to stop the opponent's first summon or search, then rebuild a K9 Xyz on the next turn
• Recovery: Use the Mulcharmy draw effects, the Ripper searchers and 12 searcher-text cards to refill the hand after a hand-trap exchange
• After siding: Not applicable: Master Duel has no side deck, so the post-side plan is absent

Why it scores here

The deck reliably opens its K9 engine on the first turn because the K9 Normal Summon rule and three copies of each of the six main-deck starters give about an 85 percent chance of at least one archetype piece in a 5-card opening hand (Inferred, proxy). It converts that opening into Level 5 and Level 9 Xyz boards, and its closing power comes from K9-X Werewolf, K9-X Ripper/M and Umbral Horror Masquerade, which together give the deck several high-ATK ways to finish. Its interaction is broad: nine hand traps, two Semi-Limited/Limited negation cards and Disablaster give it layers that hold up through a typical single interruption, and about an 81 percent chance of a hand trap in a 6-card going-second hand (Inferred). The main weaknesses are that no recorded boards exist, so the combo floor and median are text-only estimates, and that about 32 of 72 main-deck copies sit outside the K9 name, with Albion and Ecclesia in the Extra Deck lacking their Fallen of Albaz support. The score comes from consistency, interaction and closing power on the system, not from K9 being a popular archetype and not from averaging individual card scores.

Dimension scores

How the score was computed

Strategy profile: Midrange. Structural ≈ 62.4, Going First ≈ 56, Going Second ≈ 64, Meta = provisional, Tournament Reliability ≈ 57. Modifiers: engine conflicts (-3); banlist exposure (-1). Final formula: 0.80*Structural + 0.20*TournamentReliability + ContextModifiers (Meta provisional; 0.8*62.4 + 0.2*57 = 61.3, minus 4 in modifiers, rounded to 57)

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.85 · key two-card combo ≈ — · full-brick estimate ≈ 0.15 (all Inferred)
• Combo output: best PowerIndex —, median —, board-per-starter —
• Turn order: 0 going-first lines vs 0 going-second lines

Strengths

• Nine hand traps and six negation or disruption text cards cover both going-first and going-second turns
• K9 Xyz closers (Werewolf, Ripper/M, Umbral Horror Masquerade) give high ATK and piercing or multi-attack options
• Draw and searcher density (12 searcher-text cards, Mulcharmy draw effects) supports recovery after exchanges

Weaknesses

• No recorded boards, so the combo floor and median are unverified
• Off-archetype main-deck copies (about 32 of 40) dilute the K9 engine
• Albion the Branded Dragon depends on Fallen of Albaz, which is not in the list
• Usage statistics mark K9-X Werewolf, K9-66X Jacks and Number 104 as not in the deck while the card list includes them, so the core-presence figure of 24 percent is unreliable

Critical choke points

• Opening K9 summon needs the opponent to hold 2+ cards, so a hand-empty opponent turn removes the no-tribute line
• Xyz Summon of Level 5 K9 Xyz requires two Level 5 monsters on field, a single disruption can stop the line

Recommended changes

Evidence & confidence

• Verified: Legal under Master Duel ban list; all Limited and Semi-Limited copies within limit; Main 40, Extra 15, Side 0 meets Master Duel size rules; Extra Deck breakdown: 13 Xyz, 1 Synchro, 1 Fusion; Archetype purity 41.8 percent with the spread above
• Inferred: About 85 percent chance of at least one archetype core piece in a 5-card hand (proxy); About 81 percent chance of at least one hand trap in a 6-card going-second hand; Albion is likely dead without Fallen of Albaz (text read); Interaction layering and closing power from card text
• Provisional: Meta power (no dated metagame sample); Matchup coverage and format fit (no tournament link); Side-deck adaptability scored as a placeholder because Master Duel has no side deck
• Data gaps: no combos supplied, so combo floor, median and ceiling are text-only inference no tournament link, so archetype meta-share and per-pilot match record are absent no win-rate telemetry exists in YGOVN (going-first and going-second splits, matchup, brick rate are Inferred or Unknown) Meta Power is Provisional unless a dated metagame sample is supplied usage_statistics in_this_deck flags disagree with the cards list for K9-X Werewolf, K9-66X Jacks, Number 104 and Umbral Horror Masquerade, so core presence is understated deck title is null, so the name is taken from the archetype only no guides attached to the archetype