Hydrapple ex

Once during your turn, you may attach a Basic Grass Energy card from your hand to 1 of your Pokémon. If you attached Energy to a Pokémon in this way, heal 30 damage from that Pokémon.

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

Pokémon ex rule: When your Pokémon ex is Knocked Out, your opponent takes 2 Prize cards.