Grozoth [Ravnica: City of Guilds]

Defender (This creature can't attack.) When Grozoth enters the battlefield, you may search your library for any number of cards that have converted mana cost 9, reveal them, and put them into your hand. If you do, shuffle your library. {4}: Grozoth loses defender until end of turn. Transmute {1}{U}{U} ({1}{U}{U}, 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.)