Dragon Rider

+2: Search your library for a card and exile it. You may cast it this turn. You may activate this ability any time you could cast an instant
+1: Destroy target creature. Create a 5/5 red dragon creature token with flying, trample and vigilance
-X: Draw X cards, gain X life and create X 8/8 red dragon creature tokens with flying, trample, vigilance and Myriad. Venture into the Undercity