Whenever you attach a Water Energy card from your hand to Suicune, discard an Energy card attached to Suicune. (You can't attach a Water Energy card from your hand if Suicune has no Energy cards attached.)
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.