Soulless Mortician

Whenever a creature you control with an ability
that triggers on death enters the battlefield,
Soulless Mortician gets a +1/+1 counter.
If Soulless Mortician's Power is 6 or greater when a creature you control dies, return it to the battlefield on the beginning of the next
player's main phase.
Pray that there is a god of death lest I be its first.