This is the deck I have been using for climbing the ladder. This deck is amazin for many things, especially shutting down the Old Gods. C'thun can no longer stomp you, and N'zoth will be useless against you as well. Entomb Priests will not affect you as you have many great minions, and also you have capability to shut down your own minions too. I climbed to 5 from 15 so far in 1 day, and this deck is very solid. Let me explain some few extraordinary cards:

Humility: An excellent Shut Down card for 1 mana. Feel free to use it whenever you want after turn 3. Also, you can use it for 2 mana drops with strong attacks, such as Wrathguard, Millhouse Manastorm or anything else.

Argent Protector: Shutting down big minions is not enough, you also need to protect your important, or less important minions. This card with 2-2 stats for 2 mana will also aid you in board presence. Do not hesitate using that even for you Silverhand Recruits.

Doomsayer: Your most important cards have moderate mana costs. An earlier doomsayer will aid you for the next turn.

Seal of Champions: It is vital for you to take high health minions in this meta, such as Crazed Worshipper or Twin Emperor Vek'lor. Use it on Aldor or Keeper of Uldaman, and you are fine to clear them.

Coldlight Oracle: Card draw is always good. An early card draw will cause you good benefits, and because of the fact that especially priests focus on drawing more cards in the early game, you can mill them with surprise, since no one will expect you to have this in your deck.

Mind Control Tech: No need to explain I guess.

Silver Hand Regent: 3-3 for 3 mana with providing some little extra board presence? I take it.

Hammer of Wrath: Your nuke with a card draw. Good for keeping tempo.

Spellbreaker: Since the Ironbeak Owl got a nerf, this is the only replacement for it. You decide, 3 mana for 2-1, or 4 mana for 4-3?

Tournament Medic: With its 8 health, it is hard to remove him from board. Also, 2 heal inspire will keep you alive for a certain point in the board.

The Black Knight: Totally anti-meta card.

Eadric the Pure: What is better than a shutdown? A MASS SHUTDOWN! This guy is awesome, as it will crush enemy minions with its awesome battlecry. When TGT released, no one gave a chance to this guy, but Eadric, 2x Aldor, 2x Uldaman and Humility, even the control warriors will be like zoo for you.

Ragnaros, Lightlord: Arguably best class legendary in the latest expansion. Most people say it is useless, but in the end of game put him into the game and he will make you alive. Also, when you trade other minions with Lightlord, he can heal himself too, making him nearly unstoppable.

Ragnaros the Firelord: What is better than a Ragnaros? Two Ragnaroses.

If you like this deck, I will make a more detailed guide against classes, and guide for mulligan, value, trades.