Your Worst Nightmare (EB1-47) - Battle Evolution Booster

[Activate:Main] If your Leader Card is mono-yellow and you have 3 or more energy : Choose up to 1 yellow "Frieza" card with "Mecha" in its card name and an energy cost of 4 in your hand and play it. You can't activate the [Activate:Main] skill on copies of this card for the turn.