Hearthpwn

A deck that only uses common and rare cards (aside from Silas Darkmoon, which you get for free) to win against Lord Marrowgar.

The combo is very simple:

• Get the coin with Gilded Gargoyle.
• Play Auchenai Soulpriest.
• Use the coin and then play Silas Darkmoon.
• Spin to the correct direction to "gift" Marrowgar the Soulpriest. ;)
• End your turn and watch him kill himself. xD

 The other cards are removal, healing and Gadgetzan Auctioneer with the cheap spells to cycle your deck in search of the combo pieces.

Cards like Silence and Topsy Turvy are specially geared towards his Bone Spike minions.

If you have Emperor Thaurissan, you can also add him to your deck. He only needs to hit either Silas Darkmoon or the Auchenai Soulpriest to enable your combo instead of using The Coin.

Well that is it, good luck and have fun! =D