[PKM] Mewtwo (51/108) (XY Evolutions Staff Prerelease) [XY: Black Star Promos]

This attack does 20 more damage for each Energy card attached to your opponent's Active Pokemon.

During your opponent's next turn, prevents all effects of attacks, including damage, done to this Pokemon. If 1 of your Pokemon used Barrier during your last turn, this attack can't be used.