Hearthstone Blackrock Mountain - Hidden Laboratory Strategy

I have beaten the final wing of Hearthstone Blackrock Mountain Hidden Laboratory Normal Mode the same night it was released. With that, I have obtained all the Blackrock Mountain and class cards. I walk the talk and I will guide you to get more Legendary cards without purchase.

The final wing Hidden Laboratory bosses were all beaten with one class, namely Priest. The reason, the computer either had 2 silence cards or 2 removal cards in their deck. It is very easy to take advantage of it even when playing against real players. When both cards are used up, you just need to buff one taunt card to very high health and there is no way they can get pass it. So the win condition will be to buff a Deathlord to extreme high health with even free Power Word Shields, Divine Spirit, Dark Cultist (Nax). I was lucky to have 1 Velen's Chosen, 1 Temple Enforcer and 1 Inner Fire with the free decks from those quests of spectating a friend win. Finally, a Kel'Thuzad to repeated revive your Dark Cultist and Temple Enforcer and buff your minions health to seal the victory.

Omnotron Defense System

Hero Powers (Normal) -
Activate Arcanotron! (2 mana)
Activate Toxitron! (4 mana)
Activate Electron! (6 mana)
Activate Magmatron! (8 mana)
Activate! a random tron! (4 mana)

Hero Power (Heroic) -
Activate Arcanotron! (0 mana)
Activate Toxitron! (2 mana)
Activate Electron! (4 mana)
Activate Magmatron! (6 mana)
Activate a random tron! (2 mana)

I chose Priest due to past experiences. First try and I was successful. I put in all my favorite free spells like Holy Smite, Holy Nova as damage would +2 for Arcanotron and cost -2 for Electron. Also removal and buff spells. Their Toxitron will help you to AOE 1 damage but your hero healing power is 2. I saw in gamepedia the boss deck had 2 Earth Shocks and no removals. So if they do not draw Earth Shock and you buff your Deathlord (Nax) to oblivion and Inner Fire, it will be a textbook boss win.

I saw in other sites like gameskinny recommended Warrior as well. I believe it will work as Toxitron will buff your enrage minions or multiply your Grim Patron.

Recommended Class: Priest/Warrior
Recommended Cards: Holy Smite (F), Holy Nova (F) Northshire Cleric (F), Dark Cultist (Nax), Divine Spirit (F), Power Word Shield (F), Shadow Words (F), IBO, High Health Minions, Kel'Thuzard (Nax), Inner Fire, enrage minions, Gurubashi Berserkers