Wildshape Ranger is superb in E6, especially if you combine it with the Mystic Ranger variant from Dragon 336. It's actually one of the most powerful characters you can make in E6, considering Magical Training + Sword of the Arcane Order + Natural Spell + Extra Wild Shape to spend up to 24 hours per day in the form of a Fleshraker dinosaur and cast 0-3rd level Wizard spells.