In 3rd edition, good clerics can spontaneously cast cure spells... ie, they could convert a previously prepared first level spell like Armor of Faith into a Cure Light Wounds spell, or a fourth level spell like Free Action into Cure Serious Wounds. Evil clerics can convert spells into Inflict/Cause spells (Cause Serious Wounds and whatnot)... Other than that, I don't think a class like that exists. If it *did*, it would be incredibly powerful, though. Perhaps too powerful.
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