Hearthpwn

This deck is fairly straight forward. You just push out minions and clear the board + face. Comments welcomed.

Starting hand
Keep Northshire Cleric and basically any dragon (except Chromaggus). Ideally, you'd have the Twilight Whelp and another dragon to boost its stats. If you have Shadow Word: Pain, you can consider keeping it too. You really need to see what hero the opponent is playing.

How to use
You'd want to start off with the Cleric to help you well, get more cards.  Then fill the board with dragons - Whelp, Faerie Dragon... Don't be shy to remove opponent's early minions. Remember the Priest can heal. The Cleric can help you get enough cards for the Twilight Drake when it gets onto the board.

Try to always have a dragon in hand for cards like Twilight Whelp and Blackwing Corruptor.

Once you have more dragons on the board, you should be able to do some decent damage and board control. Auchenai Soulpriest is useful if you need to do board clear - Combo with Circle of Healing. Just remember that with Azure Drake, it usually means the Soulpriest will die too.

Emperor Thaurissan is to help keep the card cost low. Chromaggus is to duplicate more cards for even bigger board.

Shadow Word: Death and Entomb helps keep the board clear at later stages.  

Towards to end, Hero Priest's healing ability may not be so useful anymore. That's when you want to consider switching to damage with Shadowform.

Substitutes
Dragonkin Sorcerer can be replaced with another dragon or Blackwing Technician.  Ideally, not to replace with a higher cost dragon since this may screw with the curve. If replacing with another dragon, Twilight Drake is a decent replacement. One reason I included Dragonkin is because of my relatively small collection of cards - Relatively new player. Replaced with Blackwing Technician.