When Pokémon-ex has been Knocked Out, your opponent takes 2 Prize cards.
Once during your turn, when you play Walrein ex from your hand to evolve 1 of your Pokémon, you may use this power. Your opponent can't play any Trainer cards from his or her hand during your opponent's next turn.
If there is a Stadium card in play, this attack does 70 damage plus 20 more damage. Discard that Stadium card.