Is there any way to get an illusion on artifact weapons?

[Jomoo]

I've seen this warrior running around with Sunfury on his warswords of valarjar and I have no clue how and I couldnt ask him because hes on the opposite faction. I was wondering if anyone here knew a possible way, if there is one.

[AccountShark]

Pretty sure those swords already have their own animated texture.