Olivia, Mobilized for War + Carrion Feeder + Warhost's Frenzy + Persist Creature

Decks

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How it works

Cast Warhost's Frenzy with kicker by paying .
Activate Carrion Feeder by sacrificing the persist creature.
When the persist creature dies, it and Warhost's Frenzy trigger.
Resolve the Warhost's Frenzy trigger, causing you to draw a card.
Resolve the persist creature's trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
When the persist creature enters the battlefield, Olivia triggers, putting a +1/+1 counter on the persist creature and causing you to discard a card.
Resolve the Carrion Feeder ability.
Repeat from step 2.

In which brackets is this combo allowed, per Spellbook's Exhibition tier?

1–2 · Exhibition & Core

Allowed in this bracket.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.