Ways to gain Natural Attacks?

[Mathias1313]

Im panning on building character around natural attacks. He is a Shifter from Spheres of power.
I was specifically looking into ways to make him a beast and how do I get Rakes?
What type of feats should I be looking into? Besides the obvious like Power Attack and Multiattack.
I am looking for feats that hopefully benefit all my natural attacks. Ways to add damage riders to all my Natural attacks.
Also... plz.... how do I get Rake attacks?

[Dusk Eclipse]

I'm not sure how applicable it is since you are a Sphere Caster, but Beast Shape III (level 5 for alchemist, magus, sorc/wizards) can get you a rake attack.