Celebi-ex

Flip a coin. If heads, put a damage counter on each of your opponent's Pokémon. If tails, remove 1 damage counter from each of your Pokémon.

Flip a coin. If heads, look at the top 4 cards of your opponent's deck, and put them back on top of your opponent's deck in any order. If tails, look at the top 4 cards of your deck, and put them back on top of your deck in any order.