Use any attack from Kinda ex's Basic Pokémon or Stage 1 Evolution card. (Kingdra ex doesn't have to pay for that attack's Energy cost.)

Does 40 damage plus 20 more damage for each Energy attached to Kingdra ex but not used to pay for this attack's Energy cost. You can't add more than 40 damage in this way.

When Pokémon-ex has been Knocked Out, your opponent takes 2 Prize cards.