Suicune (WBSP 53)
To attach a Energy card from your hand to Suicune, you must discard an Energy card attached to Suicune. (Attach the Energy, and then discard an Energy card from Suicune.)
Flip a coin. If heads, this attack does 30 damage plus 20 more damage. If tails, this attack does 30 damage and the Defending Pokémon is now Asleep.