You may attach any number of Basic Energy cards from your hand to your Pokémon in any way you like.
Swinging Sphene
Flip a coin. If heads, Knock Out your opponent's Active Basic Pokémon. If tails, Knock Out 1 of your opponent's Benched Basic Pokémon.
"As long as this Pokémon is on your Bench, prevent all damage done to this Pokémon by attacks (both yours and your opponents).", When your Pokémon ex is Knocked Out, your opponent takes 2 Prize cards.
