Improved Spell Sharing and Animal Soul

[Surtyr]

SO this looks like two new feats to consider for druids especially, combat druids.

Improved Spell sharing would require both companion and druid to have the feat, however being able to cast a spell once for both and divide the duration would be nice specially with a regular/lesser rod of extend and a beast bond brand.

Animal Soul opens up the ability to cast Animal Growth and Atavism on your druid which are both large buffs especially to AC, Hitpoints, and Damage.

Problem becomes what feats would you switch out to get these? Planar wild shape, Powerful Shape, Power attack, Vital Strike, Greater Grapple, etc.

[Eltacolibre]

I never seen planar wild shape and powerful shape as mandatory choices when you can give yourself animal buffs in all forms. Elemental form with Animal Growth and whatever other buff is beastly with animal soul.