Jamie, Wave Rider

Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card whose mana value is less than this spell’s mana value. You may cast that card without paying its mana cost
if the resulting spell’s mana value is less than this spell’s mana value. Then put all cards exiled this way that weren’t cast on the bottom of your library in a random order.)

When Jamie enters the battlefield, remove a +1/+1 counter from an opponents creature.