Hidden Cataract

Hidden Cataract enters the battlefield tapped.
(T): Add (U).
(4) (U), (T), Sacrifice Hidden Cataract: Discover 4. Activate only as a sorcery. (Exile cards from the top of your library until you exile a nonland card with mana value 4 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)

#0273