Hearthpwn

This deck is solid. I was hesitant to post this for fear more people would use it. It seems most people have trouble beating it because it's not common at all, they're just not used to it. Either way it has been my highest win-rate to date...roughly 80% so far.

There is one card that can influence the deck's win rate dramatically, so your success will be determined by which card you place in that spot. Currently I have Dr. Boom in that spot. I have also had success with Jeeves and Junckbot. Either way you want a strong card there.

One other notable card is the Dreadsteed. You may think the card doesn't belong in a Mech deck, but playtesting has proved otherwise. This card actually wins a lot of games because of it's board presence, but if and only if you have the LOE expansion.  The newly added Gorillabot A-3 allows you to discover a Mech. You will almost always get full value for the card in this deck. The likely-hood you will draw a legendary Mech is extremely high, but it's an epic card you will be looking for if you have the Dreadsteed in your hand. The Anima Golem often pops up as a choice. The only downside to this card is that it destroys itself if it is your only minion, making it insanely conditional. The Dreadsteed cancels the effect because it will always be on the board. You could also add silence to your deck to cancel the self-destruct and choose the Anima Golem if you're holding a silence. Either way if that card is played in those conditions it's game over. Unfortunately Priests love to steal your Dreadsteed and a Mage will almost always use a polymorph...a Shaman will Hex, etc. If you think there is a chance it won't work, just choose a different card, many of them can help you win.