Genghis Frog + Leyline of Transformation + Quina, Qu Gourmet

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, creating a Mutagen token and a creature token due to Quina.
When the creature token enters as a Mutant due to Leyline of Transformation, Genghis Frog triggers, creating a Mutagen token and a creature token due to Quina.
Repeat step 3.

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.