Hearthpwn

This is a dragon priest deck with some nice cards from Mean Streets of Gadgetzan. Brann Bronzebeard can be used to combo with a lot of powerful battlecries like Wrathion, Drakonid Operative and Blackwing Corruptor.
You muligan for your Twilight Whelp, Netherspite Historian (if you have a dragon in hand like Twilight Welp or Azure Drake) and Wyrmrest Agent. Also keep Potion of Madness if you're going against aggro decks. If you're facing a lot of control, you can swap out a Potion of Madness for another Entomb. 
Why Wrathion ?
It's a reasonable statted card with taunt that will for sure draw you one card, but can easily draw two or three cards. If you compare this to Ancient of Lore which saw a lot of play, this might even be better. If you don't have him, I would swap in another Excavated Evil or Blackwing Technician.
Have fun playing the deck and don't forget to upvote the deck for a more detailed guide.