I'm bringing it back baby!
Playing around with it tonight in casual and doing surprisingly well. As in I haven't had any losses yet. Since no one runs shadow priest (and hasn't in months, I've yet to see it) I think it really throws people off. Every time I've used it tonight I've seen my opponent hover over my hero ability in what I can only guess is confusion.
Currently it's super strong against the aggro meta... though I fear for the first handlock I run into. I want to get the shadow word deaths in but I'm not sure how I want to do it yet. My first instinct is to get rid of Voodoo doctor... but it's been surprisingly powerful when comboed with Auchenai Soulpriest on turn 5. It's also a great backup heal once you go shadow form to keep lightspawns up.
Holy Fire and Mind Control would likely be good options to switch out... but I feel like Mind Control might actually be a very good choice against handlock so I don't want to get rid of it. Probably Ysera and Holy Fire. Ysera is great but may be a tad too slow. Might remove a shadow madness for Hogger since Hogger + PW:S is always fun.