pf2e.fyi
From Pathfinder War of Immortals, which isn't enabled.

Rapid Switch

FEAT 16
MYTHIC
Activity free action
Archetype Wildspell
Prerequisites Wildspell Dedication
Frequency once per round
Requirements Your Spellsurge aura is active.

You've honed your control over your spellsurge aura and can rapidly alter its effects. Sustain spellsurge to choose a different effect for its aura.

Pathfinder War of ImmortalsORC