Kruve, Master of Fear

+1: Exile the top three cards of target opponents library, if you exiled a instant or sorcery spell add one blue mana to your mana pool.
-3: Create X 2/1 Nightmare creature tokens, where X is equal to half the creature cards currently in exile.
-7: Exile target creature until the beginning of your next upkeep then put it back onto the battlefield under your control with haste.