Hearthpwn

Mysterious Challenger + Inspire Deck.

I don't play that much so I can't confirm that it is effective at the top ranks.  However, it has been wining for me.  I won all of my 10 games with it, except 1 loss to Patron Warrior, but that was before the Patron Warrior charge nerf.

If you get to legend with this deck, please post in the comments, I'd be happy to hear it!

Suggestions welcome!  I usually  put Kel Thuzad in my decks, but not sure what to remove to get him in.  If you don't have Trogzor, Loetheb is a good replacement.  

If you are lucky, then you can get a Muster for Battle / Knife Thrower combo early on, if not then there's enough good early cards to make it to Mysterious challenger.  By turn 7/8 you should start to win with the inspire cards.  I only used half teh secrets, because if you put them all together they don't synergize very well (bringing back your 2/1 defender with 1 health is not helpful, haha). That leaves enough room for the really good paladin inspire (Murlock Knight) and others.