Unstoppable

Look at the top three cards of target player's library. Exile any number of those cards, then put the rest back in any order.
Transmute {1}{b}{b} ({1}{b}{b}, Discard this card: Search your library for a card with the same converted mana cost as this card, reveal it, and put it into your hand. Then shuffle your library. Transmute only as a sorcery.)