Your studies in transmogrification have increased your control over shapechanging spells.
Prerequisite: You must be at least a 5th-level Wizard to select this discovery.
Benefit: When you cast a spell of the polymorph subschool on yourself, you may expend 1 minute of the spell’s duration as a standard action to assume another form allowed by the spell. You can do this as often as you like, subject to the duration of the spell. This is a supernatural ability.
Pathfinder Roleplaying Game: Ultimate Magic. © 2011, Paizo Publishing, LLC; Authors: Jason Bulmahn, Tim Hitchcock, Colin McComb, Rob McCreary, Jason Nelson, Stephen Radney-MacFarland, Sean K Reynolds, Owen K.C. Stephens, and Russ Taylor.