(Greater/Lesser) Anyspell, (Greater/Lesser) Arcane Fusion, Wings of Flurry (on an Evoker...), Warp Destiny, Choose Destiny, Heal (+Fortunate Fate, Pact of Return...). Those are the few spells I'd say were worth it in a nutshell.
As a Sorcerer, it's much easier to get all those, through Domain Access, Runestaves/Domain Staves + UMD, or a Drakehelm, among other things, such as Fiend-Blooded.