St. Lephagus, Fetish of Death

Zealotry—During your postcombat main phase, sacrifice any number of creatures you control.
(When this creature enters the battlefield, it phases
out. When the condition is fulfilled, it phases in and gains shroud until the end of step or phase, it phases out. This ability triggers only once each turn.)

Create X 1/1 white and black Zombie creature tokens with "{t}, Sacrifice this creature: Add
{w} or {b}." where X is the number of creatures that have died this turn.