Hearthpwn

I used this deck to get myself to legend while not investing ridiculous amounts of time. 

The deck can (and generally does) win against any deck. It rarely loses to itself.

Most of the loses come from misplaying (the deck is very difficult to pilot) and from the opponents high-rolling.

Proof of Legend:

Muligan guide:
 
Most of the time your opening hand will be pretty bad. So if you get NSC or a 2drop (or even 3drop if you think you won't be dead by then) you generally keep it in case you need tempo.

General gameplan:

The plan is to outvalue the Control decks (yes, you can outvalue Taunt Warrior) and stabilize against aggressive decks (you run them out of stuff and stick whatever minion to the board, you win).

In case things don't work out because of the hostile environment:

If you need to add some tech cards (crabs, oozes, whatever) the cards you cut are the Curious Glimmerroot.