Hearthpwn

http://www.hearthpwn.com/decks/239979-maloriak-heroic-demon-zoo

http://www.hearthpwn.com/decks/239991-atramades-heroic-tempo-mage

http://www.hearthpwn.com/decks/239993-nefarian-control-hunter

The boss plays a mechy deck and most of his spells are directed only to minions

• Deck Piloting :

The aim of this deck is to OTK Omnotron with a simple combo : Electron (one of the boss minions), Sorcerer's Apprentice, and Archmage Antonidas
=> infinite Fireball Oo

Early game just try to clean the board and draw as much as you can with Novice Engineer and Acolyte of Pain.

Once Electron is out keep him alive, freeze the board don't over control it, try to keep cheap spells in hand, you're mostly waiting for Gadgetzan Auctioneer, which will allow you to miracle.
Use Big Game Hunter or Polymorph on Magmatron, And continue to draw if you'r able to.

Once  Gadgetzan Auctioneer and Electron are out, the game will start to becoming interesting.
With 17 spells in the deck that are free and two arcane intellect that makes you draw more, you should be able to cycle pretty fast your deck, while easily controlling the board of your opponnent.
Now you're mostly waiting for Archmage Antonidas and Sorcerer's Apprentice. You should be able to get all the card of your decks, without too much trouble, so don't get over excited by milling yourserf,
And wait for the 9mana checkpoint :-).

Electron, Sorcerer's Apprentice, and Archmage Antonidas, on the board it's won, don't forget to kill  Gadgetzan Auctioneer if he's still here. Fireballlllllllllllllllllllllll

• Tips:

Try to always have a solution forMagmatron: Polymorph or Big Game Hunter. You can't allow him to stay alive it will burn you to death with your miracles effect.
Don't try to keep Arcanotron alive. You don't really care for spell power, and you don't want the boss to have it.

If you were to lose Electron, keep Gadgetzan Auctioneer for when it will reappear you should be able to hold of a pretty long time, with 7 cards in the deck that basically buy you another turn.

If you have 9 mana,  Gadgetzan Auctioneer on the board and Sorcerer's Apprentice in hand, it's worth it to play her, and burn your deck to get Archmage Antonidas. The opposite should not be true as you will rapidly have too much cards in hand.

• Deck building :

Archmage Antonidas,  Gadgetzan Auctioneer, Sorcerer's Apprentice, Are key in this deck, but people have proven it can work without it. I still strongly believe they make the fight much easier. Sorcerer's Apprentice is not really needed as the boss can play 2 Electron. Archmage Antonidas can be avoided if you hit him a bit with minions and use most of your spell in his face.  Gadgetzan Auctioneer still make the deck on his own, but with Azure Drake and maybe some more draw you could do it. Of course if you miss both  Gadgetzan Auctioneer AND  Archmage Antonidas, this deck is not exactly what you're looking for. 
The rest of the cards is not that essential.
Another strategy might be used with Mana Addict or Mana Wyrm in order to try an otk with their attack but this is not exactly the deck for it and others class might be better equiped in such strategy

• Epics replacements :

1. Ice Block : it's here for two reason it buys you another turn and it's free when Electron is out. If you had to replace it, Ice Barrier seems like the default choice. 
2. Big Game Hunter : He is pretty much you're Magmatron killer, i'll add a Vaporize to replace it.

I won't detail every cards replacement, but basically if you're missing cards, here is the cards that could have make it to the deck in approximative order of importance:

Spells:

1.  Dragon's Breath : it's cost reduction mechanic + Electron should make it a cheap spell, you don't want it earlier but it's mostly a placeholder because i had one place left. The second one should not be different
2. 2nd Ice Block: I thougth i had enought with one. We need to stay high enought in hp to survive Magmatron effects anyway + I don't want to have an Ice Block in play and one stuck in my hand
3. Flamecannon: the random damage might kill electron but still a good addition.
4. Mirror Image : Why not that might gain you some time for the combo
5. Any spell that can be usefull and cost 3 or less
6. The others mage spells are to avoid in my opinion.

Minions :

1. Bloodmage Thalnos : spellpower and draw for a reasonnable price, did not find a place for him, but it can be included 
2. Loot Hoarder : The Instant draw of novice enginner is better but you can afford to wait a turn, you probably have a hard time using its attack
3. 2nd Sorcerer's Apprentice : she's useless unless you're launching infinite fireball, and with the amount of spells i'm pretty confident you will easily draw your whole deck, but if you're really looking for a 30th cards this might be it.
4. Flamewaker : tons of damage when you're in mode miracle
5. Mind Control Tech : You migth gain a lot of time with this, but beware having minions will allow the boss to trade, and if you steal electron, the boss might kill him. Borderline false good idea.
6. Others minions might just be too costy, or not in the spirit of the deck.

• False good idea : 

1. Doomsayer=> it will kill Electron
2. Emperor Thaurissan=> why the hell would reduce your card cost when more than half your deck will cost (0)
3. Alextrasza=> Loss of a turn if you use it to heal yourself, and your game plan is infinite damage so no need for her
4. And basically any minions not listed => I hate minions.