Polymorph and gain SLAs

[Yogibear41]

Is there anyway to gain the SLA's of a form you polymorph or altershape into(or a similar spell)?

I know there is assumes supernatural ability for SU abilities but I am looking for something that is for SLAs.

[Eldariel]

Is there anyway to gain the SLA's of a form you polymorph or altershape into(or a similar spell)?

I know there is assumes supernatural ability for SU abilities but I am looking for something that is for SLAs.

Planar Shepherd is about the only way (and the Elemental Wildshape it's derived off). And for a good reason; there's a reason Planar Shepherd is among the top 10 most broken PRCs in the game (somewhere below Tainted Scholar, Tainted Sorcerer, Illithid Savant, Beholder Mage, Dweomerkeeper I think - then we have the whole Hathran/Halruaan Elder/Incantatrix/Red Wizard/Planar Shepherd hodgepodge, which is harder to sort out), and being able to get almost any Outsider SLAs is a big one.