Ny-et, the Ancestor

+1: If you control a card named Firr-um, put a soul counter on it.
0: Create a legendary colourless artifact token named Firr-um with indestructible and "Sacrifice a creature: Put a soul counter on Firr-um."
-2: Choose target card you control named Firr-um. For each soul counter on it, create a 2/2 black Zombie creature token. Remove all counters from it.