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There is a Legacy version here.

PFS StandardGreater Physical Evolution Feat 12

Sorcerer 
Source Player Core 2 pg. 155 1.1
Prerequisites Arcane Evolution, or Primal Evolution

You change form readily. Once per day, you can use a sorcerer spell slot to cast any common polymorph battle form spell of the spell slot's rank as if it were a signature spell in your repertoire. You can use the extra spell slot from either Arcane Evolution or Primal Evolution instead of a sorcerer spell slot.