Deny Reality [Mystery Booster]

Set: Mystery Booster Type: Sorcery Rarity: Common Cost: {3}{U}{B} Cascade (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.)Return target permanent to its owner's hand.