Hephaus, Draco Masterpiece

Flying
When Hephaus, Draco Masterpiece enters the battlefield, sacrifice it unless your sacrifice and artifact and a dragon.
When Hephaus, Draco Masterpiece enters the battlefield with a +1/+1 counter on it for each Artifact and Dragon in your graveyard.
Metal wings spread to block out the sun, devouring it's
rays and burning a path to the heart of the earth.