Trap
NormalAlien Brain
Archetype:
Alien
View:
2657
When a Reptile-Type monster you control is destroyed by battle with an opponent's attacking monster and sent to the Graveyard: Take control of the opponent's monster, and if you do, it becomes Reptile-Type.
Alien Brain — Power Evaluation
Final Score: 43 ± 8 · Confidence: Medium
- Intrinsic: 43 · Deck: 42 · Meta: provisional
- Primary role: Removal / Negation · Secondary: Utility
Why it scores here
Alien Brain is a conditional, reactive trap: it only converts when a Reptile-Type monster you control is destroyed in battle by an opposing attacker, and then it steals that attacker's monster. It is a real control swing when the trigger happens, but the Reptile-type requirement and the battle-destruction trigger keep its reliable value low. The card is run in 10 sampled decks across 6 archetypes, which confirms it is playable, but no combo evidence exists to show it converts into a board. Its ATK/DEF are 0 and do not factor in.
Axis scores
| Axis | Score | Evidence |
|---|---|---|
| Accessibility | 30 | A set trap that is live only when a Reptile is on the field and is destroyed by an attacking monster; decks run it 1.5 copies on average, but no combo or starter data confirms routes (verified text, observed decks; tier: observed). |
| Combo & Conversion | 35 | No recorded boards; conversion of a destroyed Reptile into an opponent's monster is text-derived and unmeasured (inferred). |
| Resource Economy | 45 | The Reptile is lost and the opponent's monster is gained, roughly a card-neutral exchange with no refuel or draw (inferred from text). |
| Effect & Interaction | 45 | Strong steal when it triggers, but it reacts only to one battle-destruction condition, so it is situational (verified text; tier: verified). |
| Material Utility | 10 | Trap card with no monster body, so it does not serve as material (verified text; tier: verified). |
| Resilience & Flexibility | 30 | Set trap that is vulnerable to trap negation and needs a specific board state to fire (inferred). |
| Deck-Building Efficiency | 60 | Single-copy trap with no garnet or lock cost; the Reptile dependency is the only restriction (verified text; tier: verified). |
Calculation
Weight profile: Primary role Removal / Negation only; no secondary blend applied. Intrinsic ≈ 43, Deck ≈ 42, Meta = provisional. Modifiers: Reptile-type dependency (-2). Final formula: 0.40*Intrinsic + 0.60*Deck
Strengths
- Steals the attacking monster when its trigger condition is met, a real control swing
- Single-copy trap with no garnet cost and clean timing
- Playable across 6 archetypes in the sample, confirming real access
Weaknesses
- Requires a Reptile-Type monster to be destroyed in battle by an attacker before it can fire
- Reactive and situational; it does nothing if the trigger never happens
- No recorded combo or board evidence showing what it converts into
Counters / choke points
- Trap-negating cards or effects, which can stop it from resolving (inferred)
- Not attacking into the Reptile, or setting up a board without a battle-destruction trigger (inferred)
Best use
Situational steal trap that punishes an opponent's attack into a Reptile-Type monster. Decks: Alien, Ogdoadic/Abhyss, Ragnaraika. Suggested copies: 1.
Evidence & gaps
- Verified: The card text: steals an opposing monster when a Reptile-Type you control is destroyed in battle by an attacker and goes to the GY; Trap card, not a monster, so it has no material body; Single-copy deck usage (avg 1.5 copies) across 10 decks
- Observed: Run in 10 sampled decks, 4 of which are Alien; Six distinct archetypes with 80% of decks in gameplay type 7; Partners include Reptilianne Echidna and other Alien/Ogdoadic cards
- Inferred: Trigger requires a Reptile on board and a battle-destruction event, so live frequency is limited; Steal is roughly card-neutral because the Reptile is lost and the opponent's monster is gained; Vulnerable to trap negation
- Data gaps: no combos supplied — combo conversion is text-only inference no guides supplied no banlist token — assumed 3 copies (unlimited) no usage statistics (StatisticsCard) — archetype inclusion % inferred from deck sample only