Sloppity Bilepiper [Warhammer 40,000]

Jolly Gutpipes — {2}, {T}, Sacrifice a creature: The next creature spell you cast this turn has a cascade. (When you cast your next creature spell, exile cards from the top of your library until you exile a nonland card that costs less. You can cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order.)