Counter target spell. Choose 1, 2, or 3 at random. Its controller mills (To mill a card, a player puts the top card of their library into their graveyard.) that many cards, then exiles cards from the top of their library until they exile a nonland card with a different name than that spell. They may cast that card without paying its mana cost. Then they put the exiled cards on the bottom of their library in a random order.