Seath, the Betrayer

When Seath, The Betrayer enters the battlefield, create a legendary artifact token named
Primordial Crystal with "Creatures named Seath,
The Betrayer are indestructible"
{3}: Create three 1/1 Crystalline Golem tokens. Activate this ability only any time you could cast a sorcery and only once per turn
Seath the Scaleless betrayed his own and the dragons
were no more. Thus began the Age of Fire