Infinite +1/+1 counters on creatures you controlInfinite charge counters on a permanentInfinite creature ETBInfinite creature LTBInfinite creature sacrifice triggersInfinite death triggers
How it works
Activate Spawning Pit by sacrificing the persist creature.
When the persist creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
When the persist creature enters the battlefield, Celes's second ability triggers, putting a +1/+1 counter on each creature you control.