Kefla, Roar of Destruction (Tournament Pack Vol. 7)

[Double Strike] [Activate: Battle] (2), if you have 4 or more energy and you choose 2 "Alien" cards in your Battle Area other than "Kefla, Roar of Destruction" : Return the chosen cards to their owners' hands, then play this card from your hand, and you can't play Battle Cards for the duration of the turn. [Auto] When you play this card, choose up to 1 of your opponent's Battle Cards, and it gets -20000 power for the duration of the turn.