My current character Crazytalk http://ryusukanku.deviantart.com/art/That-...ytalk-655408518 is a Native American Elf Shaman. Among other things, I gave him the benefit of having a Spirit Guide when I created him.
Anyways from what I understand there are two ways to get a new spell for most spell casters.
One is learning it from another magic user and the other can be from a spirit, and Crazytalk true to form is considering letting his Totem choose his next spell for him.
If you guys were his Raven spirit guide, what spells would you think would be interesting to add to his repertoire?