Silvally-GX (SMA SV79)
Your Basic Pokémon in play have no Retreat Cost.
Attach a basic Energy card from your discard pile to 1 of your Benched Pokémon.
This attack does 50 damage for each of your opponent's Benched Pokémon. (You can't use more than 1 GX attack in a game.)
When your Pokémon-GX is Knocked Out, your opponent takes 2 Prize cards.