Arking, Bender of Magic

Eminence — As long as Arking, Bender of Magic is
in the command zone or on the battlefield, non-legendary lands enter tapped. Your commander costs {1} less for every spell that has entered tapped.

Flying, Indestructible, Annihilator 1

Dragons you control get Shroud and Undying.
When a dragon attacks, non-dragons get -1/-1.

Another realm to reshape for dragon kind?