Sethron, Hurloon General + Cloudstone Curio + Universal Automaton + Mana Echoes

Exhibition

Decks

How it works

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Cast Universal Automaton by paying .
Universal Automaton enters the battlefield, triggering Mana Echoes and Sethron.
Resolve the Mana Echoes trigger, adding for each creature you control.
Resolve the Sethron trigger, creating a 2/2 Minotaur creature token.
The Minotaur enters the battlefield, triggering Cloudstone Curio and Mana Echoes.
Resolve the Cloudstone Curio trigger, returning Universal Automaton from the battlefield to your hand.
Resolve the Mana Echoes trigger, adding for each Minotaur you control.
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.