DARK
Number 66: Master Key Beetle
ATK:
2500
DEF:
800
View:
3101
2 Level 4 DARK monsters Once per turn: You can detach 1 Xyz Material from this card, then target 1 card you control, except this card; while this card is face-up on the field, that card(s) cannot be destroyed by card effects. If this face-up card on the field would be destroyed, you can send one of its targets to the Graveyard instead.
Number 66: Master Key Beetle — Power Evaluation
Final Score: 64 ± 5 · Confidence: Medium
- Intrinsic: 63 · Deck: 65 · Meta: provisional
- Primary role: Negation/Interaction · Secondary: Material body, Utility
Why it scores here
Master Key Beetle provides flexible board protection through indestructibility and self-preservation, making it a solid utility piece across 33+ archetypes in control strategies. While the card does not generate tempo or combo value—appearing in zero recorded high-power combo boards and generating no card advantage—its defensive role and splashability across diverse homes (Chain Burn, Infernity, Labrynth, etc.) confirm it is a legitimate tactical choice, not a forgotten niche pick. The 2 Level 4 DARK requirement and material-dependent effect limit its power ceiling, and lacking combo or guide evidence prevents confirmation of its true winning value beyond text-level inference.
Axis scores
| Axis | Score | Evidence |
|---|---|---|
| Accessibility | 70 | Appears in 94 recent decks across 33 distinct archetypes with reasonable 1.19 average copies, indicating the 2 Level 4 DARK requirement is manageable across the meta. (observed) |
| Combo & Conversion | 30 | Card text creates value through prevention rather than generation; no combo boards record it as starter or payoff, suggesting it does not drive winning lines on its own. (inferred) |
| Resource Economy | 45 | Each activation costs 1 Xyz Material via once-per-turn detach; self-preservation mechanism roughly balances the cost, but card generates no card advantage. (verified) |
| Effect & Interaction | 65 | Effect grants strong indestructibility shield to own cards and includes self-sacrifice replacement for survival; does not disrupt opponent's board directly. (verified) |
| Material Utility | 60 | Rank 4 Xyz body with 2500 ATK and DARK attribute provides solid generic material for further Xyz plays even when effect is exhausted. (verified) |
| Resilience & Flexibility | 60 | Built-in self-protection through detach cost allows multi-turn utility as long as materials remain; loses effectiveness as materials deplete. (inferred) |
| Deck-Building Efficiency | 65 | Requires 2 Level 4 DARK monsters but present in 33+ archetypes; splashable enough in control strategies despite moderate summoning constraint. (observed) |
Calculation
Weight profile: 0.7 Negation/Interaction + 0.3 Material body. Intrinsic ≈ 63, Deck ≈ 65, Meta = provisional. Modifiers: Summoning Constraint (-1). Final formula: 0.40*Intrinsic + 0.60*Deck
Strengths
- Protects your board from destruction effects across multiple turns
- Self-preservation mechanism allows survival of destruction attempts
- Works in diverse archetypes (33+) showing genuine flexibility
- Solid Rank 4 body for further Xyz plays
Weaknesses
- Requires 2 Level 4 DARK monsters (moderate summoning cost)
- Material-dependent: loses value as materials are detached
- Does not generate card advantage or tempo
- Does not interact with opponent's board
- No combo synergy data suggests it is not a combo engine piece
Counters / choke points
- Cards that bypass destruction negation or are effect-resistant
- Negation of the Xyz Summon itself
- Removal of targeted cards before protection is applied
Best use
Board Protection / Negation. Decks: Control, Chain Burn, Infernity, Labrynth, XYZ-based strategies.
Evidence & gaps
- Verified: Card requires 2 Level 4 DARK monsters for Xyz Summon; Effect grants indestructibility to targeted card while this card is face-up; Self-sacrifice replacement effect activates if this card would be destroyed; Present in 94 recent decks across 33 distinct archetypes; Most common homes: Chain Burn (20.2%), Infernity (12.8%), Inzektor (6.4%); Appears primarily in Control gameplay (76.6% of decks)
- Observed: Appears at 1–3 copies per deck (average 1.19); Plays well with Rank 4 Xyz monsters and generic staples; Present in control-focused strategies (Labrynth, Gravekeeper's)
- Inferred: Once-per-turn detach restriction limits multi-turn board protection to 2–3 turns of use per copy; Accessibility is good despite 2 Level 4 DARK requirement due to widespread presence in control decks; Acts as a tech choice providing flexibility across diverse strategies rather than a core combo engine
- Data gaps: No combo data means we cannot assess how often it appears in high-power boards or as part of winning lines No guides or expert commentary on its role and proper application No banlist status (assumed unlimited at 3 copies per format) No usage statistics (StatisticsCard rows) to confirm inclusion rates and typical copies across formats