Alien Deck #49554 — Yu-Gi-Oh! Master Duel

Deck — Deck Power Evaluation

Final Contextual Deck Power: 52/100 (±7 · Confidence: Medium)

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

Legality

Main 43 / Extra 14 / Side 0 — status: Legal.

Identity & game plan

• Win condition: Fill graveyard with Reptile monsters, summon Link/Synchro bosses with ATK reduction and board control via A-Counters; grind value through recycling and removal.; Synchro-based removal (Reptilianne Hydra destroying 0-ATK monsters) or attrition via Therion engines and field-setup loops.
• Turn 1 (going first): Activate Snake Rain or Reptilianne Ramifications to mill Reptile engine pieces; leverage Nunu/Nauya hand sends to populate graveyard; build a Link monster or Synchro as an interruption wall (Reptilianne Melusine for protection or Borrelsword for control).
• Turn 2 (going second): Use hand traps (Effect Veiler, Infinite Impermanence) to disrupt opponent; deploy board-breaker removal (Raigeki, Harpie's Feather Duster) and then use graveyard effect monsters to rebuild presence.
• Recovery: Ogdoadic/Therion engines recycle from GY via tribute mechanics and field-activation loops; Keurse tributes to resummon; Borrelsword + Accesscode provide persistent pressure and removal options across turns.
• After siding: Unknown — no side deck provided; Main Deck lacks coherent SB adaptability.

Why it scores here

This deck is a loose hybrid of Alien, Ogdoadic, Reptilianne, and Therion engines unified by the Reptile creature type and graveyard-centric recursion. It opens with reasonable consistency (P(≥1 core starter) ≈ 0.92) via Snake Rain, Reptilianne Ramifications, and Ogdoadic/Nunu milling, but lacks clear line redundancy and median combo output is modest (no board evidence provided, so inferred from card text). The deck handles going-second disruption adequately with hand traps and mass removal but struggles to close games decisively; bosses are protective (Melusine, Borrelsword) rather than aggressive. Critical weaknesses are: very high composition variance (only 12% exact-name Alien purity), 40% missing core cards by archetype stats, zero side deck preparation for best-of-3, and fragmented engine interactions that create brick hands. High pilot skill required to navigate multiple conditional engine paths. Popularity and archetype usage did not earn this score; the score reflects system consistency and resilience only.

Dimension scores

How the score was computed

Strategy profile: 0.65 Midrange + 0.35 Control (deck emphasizes resource loops and graveyard recycling over pure combo opening; interactive but not control-focused). Structural ≈ 52, Going First ≈ 54, Going Second ≈ 56, Meta = provisional, Tournament Reliability ≈ 48. Modifiers: composition_variance (-3); zero_side_deck (-2); missing_core_cards (-2). Final formula: 0.80·Structural + 0.20·TournamentReliability (Meta provisional; no dated metagame supplied)

Probability & combo summary

• Opening a starter: P(≥1) ≈ 0.92 · key two-card combo ≈ — · full-brick estimate ≈ 0.09 (all Inferred)
• Combo output: best PowerIndex —, median —, board-per-starter —
• Turn order: 0 going-first lines vs 0 going-second lines

Strengths

• Consistent engine access: ~92% P(≥1 core starter in opening 5); multiple conditional mills and hand-send triggers enable reliable graveyard population
• Multi-engine modularity: Ogdoadic, Reptilianne, and Therion engines offer flexibility in line selection and recovery paths across turns
• Adequate going-second disruption: Hand traps (Effect Veiler ×2, Infinite Impermanence, D.D. Crow) plus mass removal (Raigeki, Harpie's Feather Duster) enable realistic board breaks
• Protective bosses: Reptilianne Melusine (effect-negate per opponent effect) and Borrelsword Dragon (repeatable position change + S/T negation) provide layered disruption
• Graveyard recursion: Keurse, Zohah, and Therion payoffs allow resource regeneration and multi-turn pressure

Weaknesses

• Composition variance and low archetype purity (12.3% exact-name Alien): 40% core cards missing (15/25) create gaps in intended engine throughput; inconsistent synergy across Ogdoadic/Reptilianne/Therion sub-engines
• Fragile combo floor: Median board output estimated at 45–55 PowerIndex; no board evidence supplied, so inferred from card text; single line interdependencies and conditional GY triggers mean bricked or suboptimal T1s are frequent
• Poor offensive closing: No aggressive boss monsters (Borrelsword/Borreload lack piercing or direct damage); 3000 ATK ceiling with no evasion or burn creates long grind games
• Zero side deck preparation: No side deck in best-of-3 format eliminates post-round adaptation; archetype offers no clear tech swaps for known matchups
• Pilot-dependent execution: Multiple conditional triggers (hand-send vs draw, Synchro/Link path branching, A-Counter discretion) require high skill to optimize; error tolerance is low

Critical choke points

• Graveyard saturation: Deck relies on 5+ distinct Reptile names in GY for Ogdoadic Water Lily special summon; if graveyard is milled early or banished, recursion loops collapse
• Tuner scarcity: Only 5 Tuner monsters (Effect Veiler ×2, Reptilianne Coatl ×2, Lamia ×1) for Synchro summoning; if sent to GY prematurely or disrupted, Synchro routes become inaccessible
• Hand-send dependencies: Nunu, Nauya, and Reptilianne Nyami require hand sends to activate effects; conflicting Normal Summons or dead draws in hand prevent activation, forcing skip or suboptimal pivot
• Link Summoning gate: All Links require 2+ Reptile materials; if main-deck Reptiles are in GY or hand, Link access may fail; Cosmic Slicer Zer'oll (2-copy, searcher) is critical but not redundant enough
• ATK reduction reliance: A-Counter strategy (Alien Overlord, Kid, Stealthbuster) and 0-ATK synergy (Reptilianne Hydra, Melusine, Vaskii) are fragile; opponent can reset ATK or swap summons, breaking synergy chains

Recommended changes

Evidence & confidence

• Verified: Legality: Legal per Master Duel ban list; 43 Main, 14 Extra, 0 Side; no violations; Card text and effects: all card descriptions resolved and confirmed from evidence.json; Restricted cards: Foolish Burial (Limited), Harpie's Feather Duster (Limited), Monster Reborn (Limited) are legal copies per Master Duel banlist; Composition: 30 distinct Main cards, 12 distinct Extra cards; type/attribute/race breakdown verified; Usage statistics: Alien archetype core-card inclusion and typical copies from YGOVN archetype stats
• Observed: Hand-trap density: 4 copies (Effect Veiler ×2, Infinite Impermanence ×1, D.D. Crow ×1) across 43 Main Deck; Removal suite: 11 cards tagged with removal text (Reptilianne Nyami, Nunu, Nauya, Raigeki, Harpie's Feather Duster, Alien Stealthbuster, Alien Overlord, Reptilianne Vaskii, Therion Empress Alasia, Alien Shocktrooper M-Frame, Borrelsword Dragon, Accesscode Talker)
• Inferred: Engine accessibility: P(≥1 Snake Rain, Ramifications, or Ogdoadic Remnant in hand 5) ≈ 0.80; archetype core P ≈ 0.92; consistency estimate from hypergeometric probabilities; Brick rate: ~8–12% full brick (unresolvable opening hand) estimated from copy histogram, conflicting Normal-Summon engines, and dead cards (high-level non-starters); Combo ceiling: PowerIndex 65–75 inferred from Synchro/Link access (Melusine 2500 ATK, Borrelsword 3000 ATK) and 2–3 interactive effects per board; Combo floor/median: PowerIndex 45–55 inferred; limited starter diversity and conditional GY triggers create variance; Interruption resilience: 2 independent lines (Ogdoadic vs Reptilianne roots) without shared choke points; moderate recovery via tribute mechanics and field loops; Going-second power: 56/100 inferred from hand-trap count (4 copies, ~46% P in opening 6), mass removal access (2 board-wipes), and medium board-break efficiency; Pilotability: High skill requirement inferred from multi-branch engine paths, conditional hand-sends, GY sequencing, and A-Counter discretion
• Provisional: Meta Power: null — no dated metagame sample supplied; archetype meta-share and per-pilot match record absent; format fit cannot be validated; Post-side plan: unknown — no side deck provided; adaptability to meta is provisional; Matchup coverage: Archetype is niche in Master Duel; metagame positioning unverified
• Data gaps: No combo boards supplied: best line, median power index, board per starter all inferred from card text; no observed combo frequency or resource signatures No tournament link: archetype meta-share, per-pilot match records, and metagame representation absent; Meta Power is provisional No win-rate telemetry: YGOVN does not track game-level, matchup-level, or turn-order win rates; consistency/brick/opener success rates are inferred from probability theory No side deck: post-side plan and best-of-3 adaptation unknown; tournament reliability reduced by ~20% No guide excerpts: human strategic intent for archetype in this deck build unknown; inferred from card roles only Archetype core incompleteness: 40% of usage-stat core cards missing; unclear whether deck is intentionally rogue or incomplete implementation