Daruk, Gaurdian of Rebirth

Whenever a creature you control dies,
if you don't have a creature in exile with a Rebirth counter on it,
exile it with a Rebirth counter on it
then create a 1/2 White Spirit creature token with
"When this creature leaves the battlefield,
Return target creature card in exile with a
Rebirth counter on it to the battlefield tapped.
This creature can't be sacrificed"