Keres, Keeper of Death

Deathtouch, Protection from white
Whenever a creature goes to the graveyard,
exile it instead, and put 1 Death counter on it.
If you sacrifice Keres all creatures in exile with a death counter on it, return to the battlefield under your control, at the beginning of your end step sacrifice all creatures with death counters.
To those who desecrate my domain... feel the
wrath of the dead!