K9 Deck #770341 — Yu-Gi-Oh! Master Duel

Deck — Deck Power Evaluation

Final Contextual Deck Power: 55/100 (±8 · Confidence: Medium)

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

Legality

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

Identity & game plan

• Win condition: K9 Xyz boss pressure: K9-X Werewolf (Rank 9, 3300 ATK, multi-attack with materials) and K9-66X Jacks (2600 ATK, destruction effect), both Extra-Deck cards that need K9 material.; Side Xyz lines from the Extra Deck (Infinitrack, Number, Umbral Horror, Arc Rebellion, Divine Arsenal ZEUS), each needing its own support.
• Turn 1 (going first): Normal Summon a Level 5 K9 (Izuna, Noroi, Lantern, Jokul, Lupis) without Tribute when the opponent has 2+ cards in hand, then build an Xyz with K9-17 Ripper or Jacks while holding hand traps for the opponent's turn.
• Turn 2 (going second): Hold 1 to 2 hand traps (Ash Blossom, Infinite Impermanence, Ghost Ogre, Droll & Lock Bird, Maxx C, Cyber Dragon) against the opponent's starter, then convert the surviving hand into a K9 Xyz.
• Recovery: K9-17 Ripper and K9-LC Release Restraint / K9-X Forced Release recover K9 Xyz from the Extra Deck, and A Case for K9 and Ripper search a K9 card, so the board can be rebuilt after a single interruption.
• After siding: No side deck is run (side 0), so no post-side plan exists; each game is played with the main deck only.

Why it scores here

The deck opens a K9 Xyz plan in most games: 9 copies of the Normal-Summonable Level 5 starters (Izuna, Noroi, Lantern) give about a 72% chance of at least one in a 5-card opening hand (hypergeometric, Inferred), and the K9 core is 22 of 57 cards. Its strength is interaction: roughly ten hand traps and negation/removal cards let it answer the opponent's first play, which lifts going-second strength more than going-first strength. Conversion is less reliable: the Extra Deck mixes 14 distinct Xyz and Link monsters, and several (Kashtira Arise-Heart, Divine Arsenal ZEUS, Artifact Durendal, Vallon) have no supporting cards in the main deck, so the engine is partly dead space. No recorded boards, tournament link, or win-rate data exist, so the score comes from consistency, interaction density, and Extra Deck coherence on the system, not from K9 being a popular archetype and not from averaging card scores.

Dimension scores

How the score was computed

Strategy profile: Midrange. Structural ≈ 60, Going First ≈ 58, Going Second ≈ 70, Meta = provisional, Tournament Reliability ≈ 56. Modifiers: Engine conflict (Mulcharmy 'no cards' vs K9 board) (-2); Dead Extra Deck slots (-2); Banlist exposure (0). Final formula: 0.80*Structural + 0.20*TournamentReliability + ContextModifiers (Meta provisional; D13 dropped from Structural and weights re-normalised over 95)

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.72 · 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

• Dense hand-trap package (10 cards) gives strong going-second interaction.
• K9 Level 5 starters can be Normal Summoned without Tribute, giving consistent T1 access.
• Multiple Xyz boss options (Werewolf, Jacks, ZEUS) with a recovery route through Ripper and Release Restraint.

Weaknesses

• Off-archetype density is high (archetype purity 38.6%), diluting the engine.
• Extra Deck has 14 distinct Xyz/Link cards with several unsupported, so Extra slots are inefficient.
• No side deck, so no post-side adjustment is possible.
• Mulcharmy's empty-field condition conflicts with a K9 board plan.

Critical choke points

• K9 Level 5 starters depend on the opponent holding 2+ cards in hand.
• Werewolf and Jacks require K9 Xyz on board, so an early board wipe or negation removes the boss plan.
• Single-copy Extra Deck Xyz have no backup route if their specific material is missing.

Recommended changes

Evidence & confidence

• Verified: Deck is Legal in Master Duel: 42 Main and 15 Extra within 40-60 and 0-15, no copy-limit violations.; Limited and Semi-Limited copy counts are within legal limits (Maxx C 1, Crossout 1, Droll 2).; Hypergeometric draw figures (0.3232 for 3 copies in 5 cards, 0.8273 for 10 hand traps in 6 cards) recompute exactly.
• Inferred: Starter access and brick risk from hypergeometric odds and Level 5 starter conditions.; Going-second strength from hand-trap density.; Extra Deck dead-slot assessment from missing main-deck support.; Combo ceiling and median from card text only, since no boards exist.
• Provisional: Meta Power (no dated metagame sample).; Matchup and format fit (D13), set to a neutral placeholder.
• Data gaps: No recorded combos supplied (total_combos 0); combo ceiling and median are text-only inference. No tournament link; archetype meta-share and pilot results absent. No win-rate telemetry for going-first, going-second, matchups, or brick rate. usage_statistics conflicts with the card list: K9-17 Ripper, K9-66X Jacks, and K9-X Werewolf show in_this_deck false with copies_in_deck 0, while the cards array lists them in the Extra Deck with 2, 1, and 1 copies. The usage-based core coverage (7 of 25, 28%) is therefore unreliable and was not used. Meta Power is Provisional (no dated metagame sample).