I want to make a cleric who has the ability to spontaneously convert their prepared spells into cure or inflict, not just one of the sides. I am not having any luck in finding anything however. I thought I had read an archetype with this ability, but after reading them I didn't find any. I asked someone who played a cleric who did this, but they were faking it with a wand and I either didn't remember or didn't notice.
Is there a feat, archetype, domain, multiclassing as a cleric while a cleric, or anything that would enable this?