You can wild shape into magical beast form.
Prerequisites: Wis 25, Knowledge (nature) 27 ranks, wild shape 6/day.
Benefit: You can use your normal wild shape ability to take the form of a magical beast. The size limitation is the same as your limitation on animal size. You gain all supernatural abilities of the magical beast whose form you take.
Source: Complete Divine, page 90. Corrected for errata.