Fiend Hunter + Hero of the Dunes + Carrion Feeder

Decks

How it works

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Cast Fiend Hunter by paying its mana cost.
When Fiend Hunter enters, its first ability triggers, exiling Hero of the Dunes.
Activate Carrion Feeder by sacrificing Fiend Hunter.
When Fiend Hunter dies, its second ability triggers, returning Hero of the Dunes from exile to the battlefield.
When Hero of the Dunes enters, it triggers, returning Fiend Hunter from your graveyard to the battlefield.
When Fiend Hunter enters, its first ability triggers, exiling Hero of the Dunes.
Resolve the Carrion Feeder ability.
Repeat from step 3.

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.