This deck got me from rank 10 - 5 with only two losses. I didn't use a Decktracker because I was constantly making adjustments as I was climbing. It has beaten Cubelock, Genn and Baku Aggro Paladin, Aggro Shaman, Shudderwock Shaman, and I encountered a few rogues who conceded by turn 4.
This deck utilizes Baku the Mooneater's effect so your hero power deals 3 damage every time you use it. It might not seem like much, but the extra 3 - 4 damage from your hero power can be game-deciding in the end. The way to play this deck is:
Turn 1: 1 drop, or two 1 drops if coin
Turn 2: Two 1 drops or coin 3 drop (if you have another turn 3 play)
Turn 3: 3 drop or 1 drop + hero power, if you don't have a 3 drop
Turn 4: 3 drop + 1 drop or two 1 drops + hero power
Only trade if it's extremely favorable, and after turn 4, only go FACE
You generally lose board after turn 4, but the opponent is down to less than half their health by then, so you can finish them down with your hero power and burn. The game usually finishes by max turn 7.
I included only one 5 mana card (Leeroy Jenkins) because I found that at turn 5 you always want to play one card and hero power instead of playing an actual minion, since you want to keep pressuring your opponent, and your minion usually gets cleared anyways. If you don't have him, you can replace him with a Wolfrider.
I run two Ironbeak Owls because of all the taunts I've been seeing.
I run one Tracking to find that extra damage you sometimes need when you run out of steam after turn 5
2 copies of Unleash the Hounds because I ran into a bunch of Paladins and Aggro Shamans in ladder
My favorite tech card is Blackwald Pixie, which you can play on turn 7 to pretty much fireball face for that finishing blow
This deck is still constantly evolving, as I've only played with it for a few hours. I will post any edits below.
The only hard counter I've encountered to this deck are variants of Baku Warrior, but they're pretty rare on ladder