Hearthpwn

Below is what was written for February. See very bottom for updates to my March list (reached legend @ #4398). I won't update the list on the right, since that deck is now on HSreplays, and it's useful for mulligan stats.

Just reached legend with this deck. There are a handful of cards that can be swapped for other things, but I constantly tried a lot of different cards over the course of a week. This one just happened to be the one I hit legend with.

As you can guess, the win condition is smacking their face with Illidari Inquisitor. I previously used a  good deck that also had the 9 mana demon, but only having Inquisitor makes the combo much more consistent. The new location, Crimson Expanse, is very important in getting a good amount of value. Ideally, you will have the location down on turn 4, then stabilize for two turns, playing spells to activate Felscale Evoker. On turn 6, play Evoker if you have Dispose of Evidence, or wait until turn 7. Hit something with your Illidari Inquisitor and copy it with the location. Now you have an Evoker, damaged Inquisitor, and dormant Inquisitor. If they can't kill any of your demons, then you could do 29 damage in two turns. Likely, they will kill your first Inquisitor. If they kill all three of your demons, then hopefully you have gotten an All Fel Breaks Loose by that time, and you can re-summon 2 Inquisitors for 16 more damage.

Above may sound ideal, and not likely to happen often, but it would happen more than you would think. For more control match-ups, look to get All Fel Breaks Loose from Taste of Chaos. Use Going Down Swinging and Illidan's Gift for crowd control, if needed.

Load the Chamber is great for cheating out the Evoker even earlier, and if you run one or more Greedy Partner, you can get coins to cheat it out. Don't hurry too much against control decks though, since you want to get value from All Fel and the location.

A really fun addition that I made recently is an Ignis, the Eternal Flame, because you can get the windfury weapon and use it with Inquisitors. There have been a few times where I used it to get 40+ health from a warrior, but you can't just equip it the turn before All Fel, because they will viper it. Gotta play the 5 mana weapon and All Fel at the same time.

Reno and transform effects really hurt you, so there may come a time where you want you kill your Inquisitor purposely before turn 8, so you can infuse All Fel Breaks Loose and resummon 2 Inquisitors later.

Overall, this is a really fun deck if you like hearing the sound it makes when an 8 attack minion hits something. I've also done fun combos with the Ignis weapon and Going Down Swinging, along with things that buff your attack, like Dispose of Evidence and Burning Heart. It's certainly a deck that can feel like you're behind, but then by turn 7 you're threatening lethal and they need to answer a big demon that just hit their face. Many times there is a dormant one ready to hit the turn later. Just survive with the tools that you have until then.

Update: Reached legend on March 8 with a modified version of the deck. Been facing more aggro and minion-heavy tempo decks, like mech rogue and DK, so I've added more things to counter them, like [card]Silvermoon Arcanist[/card] + [card]Unleash Fel[/card]. Mech rogue is probably the hardest matchup, since they can either go a bit wide, or make one big minion. Aggro Paladin can be a little difficult, since it can hard to remove everything they have, so may want to use Illidan's Gift for Chaos Nova. Paladin is still about a 50% winrate for me.

Removed:

Fossil Fanatic , Mark of Scorn, Greedy Partner 

I didn't have enough 2 cost cards for Partner to be consistent. Fossil Fanatic is still probably fine for the deck, since in some matchups it's important to draw All Fel Breaks Loose. Mark of Scorn wasn't consistent.

Added:

Weight of the World , Silvermoon Arcanist , Unleash Fel

Weight certainly helps activate Ignis more, and card draw can be really important in some matchups (since you want to have All Fel). Arcanist/Fel has saved me a bunch of times.