Karthuk, the Betrayer

{2}{w}{w}{r}: Exile all creatures with the sub-type Dragon in all graveyards and destroy all creatures with the sub-type Dragon.
All creatures with the Dragon sub-type have -2/-2, lose Flying and are tapped until Karthuk, the Betrayer is removed from the battlefield.
Reborn with scales of iron and wings of ash, The Betrayer prepared to doom his next race.