The Shifter Class' Alternate Forms are considered Wild Shapes. That helm might also work for Ulbrig, sin his Griffon Form is a Wildshape. I think. After all, Master Shapeshifter Mythic Feat requires Wildshape, and the Feat works on Ulbrig and the Basic Shifter class.
@@GoldDragon1 I wasn’t sure if they had implemented it that way. You’re right that Master Shapeshifter gives him unlimited Wild Shapes per day, so I should’ve put that together. I always think about the first part of the effect that just says it needs a polymorph effect.