Voldaren Pariah transforms on it's own

[Adanaz]

Hello,

I'm having trouble with Voldaren Pariah transforming whenever she wants causing my opponent to sacrifice 3 creatures and without me sacrificing any. The transformation goes onto the stack in excess of 20 times. It is completely random and sometimes doesn't happen. Screenshot attached.

Best wishes,

Adam

[Adanaz]

P.S. This can happen, even when I don't have 3 or more of my own creatures to sacrifice.