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Rules Text

Hidden Cataract enters the battlefield tapped.

"Tap": Add "Blue".

"4""Blue", "Tap", 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.)