Toph, the First Metalbender + Haru, Hidden Talent + Firdoch Core + Oxidda Daredevil

Exhibition

How it works

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Cast Firdoch Core by paying .
When Firdoch Core enters, Haru triggers, earthbending Firdoch Core, as it's a land due to Toph.
Activate Oxidda Daredevil by sacrificing Firdoch Core.
When Firdoch Core dies, Haru triggers, returning Firdoch Core from your graveyard to the battlefield.
When Firdoch Core enters, Haru triggers, earthbending Firdoch Core, as it's a land due to Toph.
Resolve the Oxidda Daredevil 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.