Teralon, Endless Dragon

{3}: Create a 'Teralon's Head' token. It is a
3/3 multicolored Dragon Hydra Token with Haste.
When this creature would be destroyed, you
may sacrifice a 'Teralon's Head'. If you do, regenerate this creature.
When this creature leaves the battlefield, destroy all 'Teralon's Head' tokens you control.