Primal Ululations

Persist (When this is put into a graveyard from the battlefield, if it had no -1/-1 counters, return it under its owner's control with a -1/-1 counter.)
Primal Uuluations isn't a creature unless it has one or more -1/-1 counters on it.
{b/r}{r/g}{g/u}: Put a +1/+1 counter on target creature.
{r/g}{g/u}{u/b}: Each player sacrifices a nonland
permanent. Activate only once per turn.