Cell Max, Advent of Despair (BT22-005) [Critical Blow]

Product Details

[Barrier] [Blocker]
[Auto] When this card attacks, choose up to 1 of your opponent's Battle Cards and it gets -15000 power for the turn.
[Auto] [Once per turn] If it's your turn : When one of your card skills reduces a card's power to 0 or less, switch this card to Active Mode.