Cloudstone Curio + Resolute Reinforcements + Phyrexian Altar + Doubling Season

Exhibition

Decks

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How it works

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Cast Resolute Reinforcements by paying .
When Resolute Reinforcements enters the battlefield, it and Cloudstone Curio trigger.
Resolve the Cloudstone Curio trigger, choosing to return nothing to your hand from the battlefield.
Resolve the Resolute Reinforcements trigger, creating two 1/1 Soldier creature tokens.
When the Soldiers enter the battlefield, Cloudstone Curio triggers twice.
Resolve the first trigger, returning Resolute Reinforcements to your hand from the battlefield.
Resolve the second trigger, choosing to return nothing to your hand from the battlefield.
Activate Phyrexian Altar twice by sacrificing the Soldiers, adding .
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.