Frieza, the Onslaught Begins

[Blocker] [Auto] Y, if your Leader Card is a yellow "Frieza's Army" card and all of your energy is mono-yellow : When this face-up card in your life is placed in your Drop Area, play this card from your Drop Area. [Auto] If it's your turn : When this card is played, choose up to 1 of your opponent's Battle Cards with an energy cost of 4 or less in Rest Mode and KO it.