Gunthak Grit. No more game breaking than DBC mounts in Luclin on other tlps. Or they can block the buff on Miragul.
It doesn't give Gunthak Grit. The only item that gives that particular buff is Gunthak Swabby's Eyepatch from "Call of the Forsaken" expansion from completing the "Lesser Answerer" achievement. The small AC buff from this polymorph wand is not the same buff.