Heralds of Tzeentch [Warhammer 40,000]

Set: Warhammer 40,000 Type: Creature — Demon Rarity: Uncommon Cost: {4}{U} FlyingCascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order.)