Hearthpwn

Very good and fun deck if you know how to play it. Other priest deck are very often too greedy, this deck allows you to draw you important cards faster.

RDU said Mirage Caller and Forbidden Shaping are bad cards, after playtesting I must say that Mirage Caller is very good and shaping is slightly worse than silence, but I still like it more because it gives you more fun (summon lightlord on 8 mana Kappa )

Possible replacements-

Silence instead of Forbidden Shaping

Instead of Gluttonous Ooze or Kabal Talonpriest - Kabal Courier , Coldlight Oracle , Curious Glimmerroot or Novice Engineer also Tar Creeper is very good, depends on your taste. You can also play Crabs depending on the meta. Mistress of Mixtures is option too.

Burgly Bully instead of Cabal Shadow Priest

You can play version with Circle of Healing and Auchenai Soulpriest . Or play Mind Blast to combo with Prophet Velen .

I don't like Greater Healing Potion or Snowflipper Penguin some streamers play (Thijs for example) also Kabal Songstealer is too slow card. Same with Mass Dispel . Elise the Trailblazer is also sometimes played in this deck but I think it's very bad pick, it is slow and actually makes probability to draw your key cards worse.

Skulking Geist is too slow in my opinion and almost doesn't help agaisnt jades, you can play it instead of 6 or 8 drop but I helps more against evolve than Jades.

My personal choices are Cabal Shadow Priest because I like stealing enemy minions and Free From Amber because you can play it to get minions you need in specific situation. You can replace these cards with cheaper ones I listed before or with The Lich King or Obsidian Statue .