Hearthpwn

This is one of my favorite decks I've played. Been changing and adding to it for a long time with each new expansion. It uses a wide variety of cards but can be heavily modified.

Muligan: Try for Northshire Cleric, Twilight Whelp, and Shadow Word: Pain in most all matchups. Try for Wyrmrest Agent against Aggro and Netherspite Historian against control. You can find a nice mana curve many times with this deck so keeping a 1, 2, 3 mana hand is great.

You can change some dragons out (usually either Twilight Drake, Twilight Guardian, or Book Wyrmand see what works for you. More spells can be added too but the idea is to keep more minions as they work well off each other. 

Combos: Twilight Acolyte with Cabal Shadow Priest is basically a 9 mana Mind Control with lots of board presence! Try to save them for things like Voidlords, Ragnaros the Firelord, and The Lich King. Also remember MOST of your minions are not damaged by Dragonfire Potion but remember which ones will be.

Win conditions: Out value-ing your opponent with dragon synergies and effective trading will usually be your key to victory. You should be able to trade and clear their board while still leaving yourself with bodies to hit face repeatedly and eventually kill them off. Ysera can create immense value late game and can win you lots of matches with cards like Dream, Nightmare, and Ysera Awakens. With most aggro decks, as long as you can get board presence to trade, you can usually survive long enough to get you board clears and from there, it's game over. Hard to come back from a Duskbreaker only to be hit again with a Dragonfire Potion or Primordial Drake a bit later.

Thanks for reading! Please try it out. Any feedback is welcome!