Malignant Impulse

Exile the top two cards of each player's library. Until end of turn, you may play cards exiled this way, and you may spend mana as though it were mana of any colour to cast nonland cards exiled this way.
"I suppose that to defeat such narrow minded enemies, I'll have to stoop to your level. Don't worry,
I'll only be staying here long enough to crush you."
-Vrana, Archwitch.