M Gardevoir-EX (STS 79)
Despair Ray
110+
Discard as many of your Benched Pokémon as you like. This attack does 10 more damage for each Benched Pokémon you discarded in this way.
When a Pokémon-EX has been Knocked Out, your opponent takes 2 Prize cards.
When 1 of your Pokémon becomes a Mega Evolution Pokémon, your turn ends.