Ugin, Eye of the Tempest

+3: Put a 4/4 red and green Dragon creature token with flying onto the battlefield.
-6: Until the end step of your next turn, Ugin, Eye of the Tempest becomes a 10/10 colourless Dragon creature with haste, flying and trample.
-14: Deal X damage to target player, where X is the total power among Dragon creatures you control.