Animar, Soul of Elements + Cloudstone Curio + 2x Creature with Morph or Megamorph

Exhibition

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How it works

Animar has at least three +1/+1 counters on it.
One of the morph or megamorph cards must be in your hand, with the other on the battlefield.
2x Creature with Morph or Megamorph

Cast the morph creature card in your hand for its morph or megamorph cost by paying due to Animar.
Animar triggers, putting a +1/+1 counter on it.
When the morph creature enters the battlefield, Cloudstone Curio triggers, returning the other morph creature from the battlefield to your hand.
Repeat.

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.