Hearthpwn

Used this as a shell and took the top 5-6 comments or so and modified it.  Made this, https://www.hearthpwn.com/decks/1117106-easy-win-first-try-baron

Won my first try.  If you have Anton it's an easy win.  Didn't even need the silence, secrets, or Alex.  Just used the card draw and giants.  Anton sealed the deal.

I tried a version of this and have pretty good win rate. I use 2 counterspells instead of the frost novas to counter the living bomb spells. 2 novice engineers instead of ethereal arcanists to draw faster into my moltens and echo of medivh  besides the ethereal arcanists are just a useless target for living bomb and alexstrazsa instead of duplicate to lower baron geddon's hp to 15 and kill him easier before things get out of control. U can kill him without alexstrazsa in the deck though it just requires u to spawn more molten giants and do it before he kills you. U can put an ancient brewmaster instead or a spellbreaker. It is a very solid deck to beat this boss. 

this deck needs silence.  i failed twice then removed the archanists and unstable portals for owls and spell breakers and won easily.

This deck only seems to have it's best success if you actually own two Echoes. I tried it with just one (using a second Duplicate in it's place) and could get close, but not quite enough to finish the job before I'd deck myself or die.

It was a fun deck to play in this fight, though.

-1 Echo of Medivh

+1 Ice Barrier

Got him on my 2nd try. Thanks!

Thanks for the deck.

Since I didn't have all the cards you suggested, I added Archmage Antonidas.

He goes EXTREMLY well with all the spells in this deck and the Fireballs are perfect to use up all 10 mana (2 x Fireball + Ping) and to kill any minion Geddon plays. And of course they chew through his 50 armor & 50 live in no time.

Also, the AI seems to prioritize Ethereal Arcanists higher than Archmage Antonidas when casting Living Bomb. Thus Antonidas is pretty save.

At first glance this deck looked really good, but on second inspection after trying it a few times and building. Iv decided it lacks an incredible amount of disable and lethality, This is a really high RNG dependent deck also along the line of what baron draws.  15 tries resulted in 10hp with iceblocks used by turn 6, yay now i play a molten giant, countered by living bomb or double lava burst. oh iv played two molten giants, living bomb, no panda in site, nothing to trade for, no iceblock. Sorry, but I did not find this effective. Especially in the video how the 2/4 hits his acoldyte and not the face. Constantly it will go for my face not my creatures. 

Congrats to those who had success with this deck.

My Ethereal Arcanists became raidbosses lol

-1 Echo of Medivh (only have one atm)

-2 Ice Block (have none)

+2 Counterspell 

+1 Ice Barrier

Worked first time for me, thank you.

Thanks, worked first time for me.

I agree that it can be heavily dependent on RNG, but then again that's true for every deck. Worked on the second try. Thanks for the deck.

First try, thank you for the deck.

I just tried this deck for the first time... everything seemed to go well until 7th turn. I dropped double molten just to get double living bombed, luckily I had duplicate and ice block on. 8th turn, I drew into another molten, dropped 3 molten this time... guess what? Double living bomb on 2 of the 3 molten again. WTF? how many living bomb does this guy have.

*Tried it again 2 more times and finally did it on the 3rd. It was clutch but it seems Geddon only has 4 living bombs or at least he only were able to use 4 before he died.

I find if i don't have one or two Youthful Brewmaster when he does The bomb I just die. Looks like i am not playing this right.

Sorry I guess this is not the deck for me...

update.. finally beat him thank you.

If you do get living bombed and you don't have brewmasters, you need to trade your minions into something to kill them off or sometimes frostbolt your own guys. It happens.

More often than not its a molten that gets bombed and I can't kill it off.

That can happen sometimes also. Sometimes its better to wait to Molten until you have an answer for it or when baron has something big on the board, but that situation doesn't occur often.

Worked second try. Thanks!

Worked beautifully, thank you.
(-1 Echo of Medivh (only have one atm) +1 Counterspell)

Glad it worked for you!