Genghis Frog + Artificial Evolution + Stridehangar Automaton

Decks

How it works

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Cast Genghis Frog either from your hand or from the command zone by paying plus commander tax if applicable
When Genghis Frog enters, it triggers.
Holding priority, cast Artificial Evolution by paying its mana cost, changing all instances of "Mutant" on Genghis Frog to "Thopter".
Resolve the Genghis Frog ability, creating a Mutagen token and a 1/1 Thopter artifact creature token due to Stridehangar Automaton.
When the Thopter enters, Genghis Frog triggers, creating a Mutagen token and a 1/1 Thopter artifact creature token due to Stridehangar Automaton.
Repeat step 5.

In which brackets is this combo allowed, per Spellbook's Spicy tier?

1–2 · Exhibition & Core

Spellbook classifies this as Spicy — not for these brackets.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.