Umbral Collar Zealot | First Day of Class (and one other card)

Persist Creature

Cards

First Day of Class in hand.
Umbral Collar Zealot and Persist Creature on the battlefield (Persist Creature without a -1/-1 counter on it).

Cast
First Day of Class by paying ({1} magic symbol) ({R} magic symbol) .
Activate
Umbral Collar Zealot 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,
First Day of Class triggers, putting a +1/+1 counter on the Persist Creature.
Resolve the
Umbral Collar Zealot ability.
Repeat from step 2.

This combo has been estimated to be Exhibition (Bracket 1+).