Swift Warkite + Mirror Image + Ashnod's Altar

Exhibition

How it works

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Cast Mirror Image by paying , choosing to have it enter the battlefield as a copy of Swift Warkite.
When Mirror Image enters the battlefield, it triggers.
Holding priority, activate Ashnod's Altar by sacrificing Mirror Image, adding .
Resolve the Mirror Image trigger, returning Mirror Image from your graveyard to the battlefield as a copy of Swift Warkite.
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.