Hisuian Heavy Ball (029/053) [SV: Ancient Koraidon ex Starter Deck & Build Set]

Look at your face-down Prize cards. You may reveal a Basic Pokémon you find there, put it into your hand, and put this Hisuian Heavy Ball in its place as a face-down Prize card. <em>(If you don't reveal a Basic Pokémon, put this card in the discard pile.)</em> Then, shuffle your face-down Prize cards.