Ghalta, Stampede Tyrant + Cloudstone Curio + Mirror Gallery + Mirror Image

Exhibition

How it works

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Cast Ghalta by paying .
When Ghalta enters the battlefield, it and Cloudstone Curio trigger.
Resolve the Cloudstone Curio trigger, returning Mirror Image to your hand if its on the battlefield, or returning nothing to your hand otherwise.
Resolve the Ghalta trigger, putting Mirror Image onto the battlefield as a copy of Ghalta from your hand.
When Mirror Image enters the battlefield, it and Cloudstone Curio trigger.
Resolve the Cloudstone Curio trigger, returning Ghalta to your hand from the battlefield.
Resolve the Mirror Image trigger, putting Ghalta onto the battlefield from your hand.
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.