So just played a game with mage VS priest. I played hipster and chose “shadow word: death”. Then some turns later I played Elite Tauren Champion and started a ROCK DUEL. After i get the “Molten pick of ROCK” I played “energy shaper” and my “shadow word: death” transformed into “metamorphosis” while still keeping the visual picture of “shadow word: death”. But it had a legendary frame. (Not sure if “Elite Tauren Champion” had an impact here but I think so).
I hope everyone could follow my story here. It wasn’t really game changing but a nice visual bug 
I have a picture but not sure if I can post it here.