[PF/3.X] Improving my shapeshifter and his natural attacks

[The Insanity]

I'm looking for feats that would improve my Master of Many Forms's shapeshifting abilties and his natural attacks.

[Elricaltovilla]

I'm looking for feats that would improve my Master of Many Forms's shapeshifting abilties and his natural attacks.

What's the build? What sources are allowed? What level are you at? How many feats do you have available? What level are you going to?

[Necroticplague]

Improved Natural Attack, Vile Natural Attack, Exalted Wild Shape, CryohydraFrozen Wild Shape, Multiattack, Snatch, Rending Constriction, Rapidstrike, Multigrab, the Improved versions of some of these.

[The Insanity]

What's the build?
I didn't want to give up too much information because my DM sometimes reads this forums, but I asked her to avoid this thread, so I can be more open now.
Changeling NE Wildshape Ranger 5/MoMF 10/Nature's Warrior 5 gestalted with X 4/Warshaper 5/X 11 (X will probably be ToB classes and some templates)


What sources are allowed?
All PF and 3.X official. 3rd party on a case-by-case basis. I avoid homebrew.


What level are you at? (...) What level are you going to?
I'm planning a 20th level progression.

I don't play shapeshifters. Am I right to assume that best combat style for them is going for natural attacks?