Darachon, Void Prophet

+1: Create a 4/4 red Dragon creature token with flying.
-3: Gain control of target creature an opponent controls until the end of your turn. Untap it. It gains haste until the end of your turn.
-10: Reveal the top 10 cards of your library. Put any number of dragon cards among them onto the battlefield. Transform Darachon, Void Prophet.