Monstrous Vortex (Retro) [Modern Horizons 3]

Set: Modern Horizons 3 Type: Enchantment Rarity: Uncommon Cost: {3}{G} Whenever you cast a creature spell with power 5 or greater, 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.)