Hurl into History [LCI - 59]

Rarity: U #: 59 Creature Type or Sub Type: Instant Rules Text Contains: Counter target artifact or creature spell. Discover X, where X is that spell's mana value. (Exile cards from the top of your library until you exile a nonland card with that mana value 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.)