Kreeva, Tempest Caller

: Play with the top card of your library revealed. You may play the top card of your library if it's an instant or sorcery card.
+3: Until end of turn, whenever you cast an instant or sorcery, exile it and copy that spell twice. You may choose new targets for the copies.
-12: Reveal the top 10 cards of your library. You may cast any number of instants and sorceries revealed this way without paying their mana costs.