Polymorph and origin form ex abilities.

[Yogibear41]

Is there anyway to retain your original racial extraordinary abilities when you polymorph into another form? For example if a troll Polymorphed is there anyway for it to retain its regeneration?

[Vaern]

The master transmogrifist's infinite variety ability lets you assume the form of one creature while splicing certain types of abilities from a second creature onto it. The troll in this case could, for example, polymorph himself into a dire wolf while adding a troll's regeneration ability to the wolf's form.
This won't allow you to keep all of your extraordinary abilities, though. You only get to pick one feature of a creature to splice onto the form you're polymorphing yourself into.

If the troll can achieve divine rank 6, the shift form salient divine ability allows a deity to assume a different form while retaining all of the extraordinary abilities of its original form.