Gengar

Poke-POWER: Fainting Spell

Once during your opponent's turn, if Gengar would be Knocked Out by damage from an attack, you may flip a coin. If heads, the Defending Pokémon is Knocked Out.

Put 3 damage counters on 1 of your opponent's Pokémon. If that Pokémon has any Poké-Powers, put 6 damage counters on that Pokémon instead.

Look at your opponent's hand. This attack does 30 damage times the number of Trainer, Supporter, and Stadium cards in your opponent's hand.