Darkrai Vstar

During your turn, you may put up to 2 Item cards from your discard pile into your hand. (You can't use more than 1 VSTAR Power in a game.) VSTAR rule — When your Pokémon VSTAR is Knocked Out, your opponent takes 2 Prize cards.

This attack does 30 more damage for each Darkness Energy attached to all of your Pokémon.