Sarkhan, Dragoncaller

+2: Look at the top 8 cards of your library. You may reveal a dragon card from them. If you do, put it onto the battlefield. Exile the rest.
-2: Dragon creatures you control gain vigilance and "{t}: This creature deals damage equal to it's power to target creature" until end of turn.
-10: You get an emblem with: At the beginning of your upkeep, create X 3/2 dragon creature tokens, where X is equal the number of dragons you control