Kale, Sister of Annihilation

[EX-Evolve] B : Blue "Kale" with an energy cost of 1. (Play this card on top of the specified card.) [Auto] When a card evolves into this card, you may choose all of your Battle Cards other than this card and place them in their owner's Drop Area. If you do, choose all of your opponent's Battle Cards with energy costs of 4 or less and return them to their owners' hands.