Safi'jiiva, Perfect Life

Flying,

Safi'jiiva, Perfect Life has +0/-1 for each Sapphire Energy counter on it.

Whenever this creature would leave the battlefield
remove a Sapphire Energy counter from it: make it indestructible until end of turn instead.

Remove a Sapphire Energy counter, {t}: Destroy all creatures from each opponent with power less than 4.