Hearthpwn

Oh look! Finaly there is use for [card]Gelbin Mekkatorque[/card] xD

Hate to break it to you but this deck has a 1 in 10 chances to win against Baron Geddon... Not a very consistent deck.

Got it the first time and it was fun to play.  Thanks.

thanks for putting up the build.  i didn't think of doing warlock but god damn does it make the fight easier.  I didn't use imp-losion, bane of doom, only 1 siphon soul, no lord jaraxxus, no owls, and no gelbin mekkatorque, and only 1 clockwork either due to not having them or forgetting to add them.
instead i used:
2 Power Overwhelming - deals extra damage and kills the minion so the bomb effect doesn't go off, plus the minion becomes a good void terror target or a [card]Sacrificial Pact[/card] target.
2 Imp Gang Boss - good for spawning 1/1's for trading with the 5/1's as well as buffing with the power overwhelming or void terroring.
1 Youthful Brewmaster - likes others have said, good card to bypass stuff
2 Ancient Brewmaster - same as youthful
2 Antique Healbot - allows you to survive longer until you get Mal'Ganis and every little bit helps in this fight.
my build overall.  took only 2 tries.  http://www.hearthpwn.com/decks/228486-heroic-warlock-geddon-based-on-hisoka23s-build

Good deck, I don't have  Gelbin Mekkatorque, so I did Alexstrasza In his place, did 35 dmg xD. Thx

Tip 3. Try subbing out an owl for a young brewmaster. If Malganis gets the bomb put on him silencing him is no good, but brewing him back after trading or doing 9 to the face is great :)

^^ For anyone else struggling with this. 

Solid, I traded out Jaxx/siphon/demonheart/gelbin for two brew and two wailing, got it first try after failing with other decks

First attempt. Ty. Was able to get good void draws.

This deck is totally not working for me. Either i get Malganis too soon, or he is in the top of the deck. I could have won the last time i tried (10th time by now) if malganis would have showed up, but he was in the last 3 cards of my deck.

Is it really that easy for the rest of the people here? Cause after 10 times i'm beginning to feel like i'm in a really bad luck streak or something

Just about won on the 2nd try, he played Living Bomb on my Mal'Ganis a turn before I just managed to fish for lethal. I took out Felguard for Imp Gang Boss and Sacrificial Pact for Healbot as I couldn't guarantee an early enough Mal'ganis and needed the 5 mana drops for a better curve. You basically want a 1 drop and get an early Mal'Ganis anything else makes it quite a struggle.

thanks for the deck!

But i needed like ~10 trys 

I don't have a Malganis, but I didn't need one, I got this first try. I had a jaraxxus, but I beat Baron before I drew him.

Power Overwhelming works wonders, you buff your minion, trade or attack to the face, and it dies before the living bomb thing goes off. The non demon cards I used were mainly heal bots and taunt minions, like belcher.

In general, you don't need any legendaries- i had sneeds but he didn't do much. Just make sure you have few cards in each mana slot, especially in the one mana, and use your hero power each turn. With enough cards you can always avoid his hero power. one of the best cards for me was floating watcher, Baron will very often attack him without being able to kill him, so he will continue absorbing damage like a sponge as you use your hero power each turn. Buffing mistress of pain with demonfire is a good idea, she will help keep your health high enough to use the hero power every turn.

Excelente deck.

I dn't have some cards, but I've replaced:

Felguard x Sense Demons

Bane of Doom x Feugen

Demonheart x Stalagg

Lord Jaraxxus x Majordomo Executus

Gelbin Mekkatorque x Sylvanas Windrunner

fantastic deck

I beat it first try without even touching any of the legendaries

The whole game felt kind of easy to me, not sure why this is isn't rated higher. Every time he pulled out a living bomb I had an answer to it; maybe I just got lucky.

I beat Geddon second try with this deck! He's a bastard to fight man. I almost lost to him topdecking Fire Elemental which killed my Mal'Ganis, but luckily I had just enough damage to get lethal with Lord Jaraxxus and the trusty 3 damage from Blood Fury! Thank you for the deck man. 

Took me four tries and a bit of luck to pull Mal'Ganis at the right time. Once Mal'Ganis was up, I played Lord Jaraxxus and it was GG.

Haha, I know what you mean.  I finally beat Baron after 8 tries.  I didn't draw either leggie till my final game.  I also didn't draw any of my silences till my final game.  Im used to it though, a lot of people make decks becuase they are used to really good RNG, I on the other hand, don't have that sort of RNG.  

I do think this is a great deck and it doesn't deserve down votes from the -10 RNG players, but I can understand why people get upset.

Cheers.