I'd recommend running it in any Auchenai deck, it's a great tool for a lot of Priest's bad match ups. It can push you out of lethal while still leaving mana for removal and it can burst down a Warlock in Jaraxxus mode or before they Reno.
If I were running an achenai deck I would, obviously, in an elise deck that I was playing at the time or a dragon priest deck I use from time to time it does not fit.