Hearthpwn

This priest deck is based on solely using your opponents played minions against them.  This differs from Thief Priest where you are stealing their cards and hopefully they work.  I don't think that works as  you are paying a premium, versus a rogue who gets cards at a discount.  The rest of the cards are used to disrupt your opponent's style of play while you use their minions against them.

These are your traitor cards, but they play significantly different roles in this deck.
Shadow Madness × 2  
Cabal Shadow Priest × 2  

Cabal Shadow Priest is used in conjunction with Lazul's Scheme to steal a dangerous minion and bring him to your side.  

Shadow Madness is played to either clear minions, or as a possible OTK when used with Topsy Turvy and Divine Spirit.

Hecklebot and Unseen Sabotour are your main disruption cards.  Ain't nothing better than a Hecklebot into a Forbidden Words Shadow Word: Death or turn 9 [card]Zilliax[/card].  Unseen Sabotour is best played on an empty board or when you just have that feeling.

Other tech cards like Tinkmaster Overspark (which can save the day) or Harrison Jones are obvious use cases.  Same with Convincing Inflitrator and Zilliax.  

EVIL Conscripter and EVIL Cable Rat are there to get value, and if you get the transform lackey, it gives you another option for Shadow Madness.  However, all the lackeys have good value for this deck, but both of these cards could be replaced with others, but they also make the deck slower as it will have no 2 drop minions.  

Some things are bound to change, but this deck works wonders against some of the more meta decks (mech hunter, I am looking at you) and there is nothing better than beating a Net Deck with it's own minions.