I'm putting together a new class based around shapeshifting. I am adapting it with aspects of the druid and alchemist. Currently, it will be a spontaneous spellcaster using the Alchemist spell list(spells known matching the bards minus the 0 lv spells). Spells(Or shifts as I will call them) will only effect self, but do not require verbal, semantic, or material components(They still provoke attacks of opportunity, still require expensive spell components). The abilities of the class act sort of like the druids wild shape, but starts at lv 2 with alter self, with each 2 levels after adding the equivilant transformation spells effects(Beast shape, undead anatomy, elemental body, monsterous physique, Form of the Dragon, etc) at the appropriate levels in a manner similar to how wildshape does(Lv 3 spell[BS I, MP I, UA I] gained at lv 4, Lv 4 [BS II, MP II, EB I, VS I] at 6, Lv 5[BS III, EB II, PS I, UA II, MP III, VS II] at 8, etc). This gives the shapeshifter a much wider range of forms he can take, though he is still limited by how many times per day he can change shapes until lv 20.
Of course I would like some feedback and ideas on other abilities to add or second opinions on balancing the class.