Seath, the Archduke

Flying, Menace
When this card enters the battlefield, create a colorless 0/5 Crystal token artifact creature.
As long as there is a colorless Crystal token
artifact creature on the battlefield, Seath,
the Archduke has Indestructible
"Awarded a Dukedom for his betrayal of the Everlasting Dragons, the albino dragon Seath the Scaleless has since become obsessed with his sorcerous experiments and research"