Hearthpwn

Greetings!

So unfortunately, this isn't one of my dust free versions, but it will hopefully help you beat this crazy boss.

He's crazy. Seriously, there's some insane things you have to go up against.

• Executus begins the game with 30hp and 15 armor. When he dies, he summons Ragnaros, who will have 30hp and 30 armor. In total, that's 105 health you have to eat through. Yikes!
• The Majordomo's hero power summons a 3/3 minion. Similar to Anubrekhan, the first Naxx boss, except with 1/1 fewer stats. Don't let this lul you into a false sense of security: Executus has a number of removal spells that complement his cheap minions, often leaving you fighting for the board.
• Ragnaros' hero power is the typical 2 mana deal 8 damage to a random enemy. Except it procs twice. Hope that you aren't unfortunate enough to get all four to your face :S
• Executus has somewhere around seven molten giants in his deck. Yah, seven. In other words, be careful with his health!

With that out of the way, here's how I beat him:

mulligan for cheap minions that can deal with his 3/3s. The faerie dragon is especially useful because he can't use removal on it, as is the ironfur, as it will save you some face damage. If you're lucky, he won't coin out one of his mini-me's, giving you a turn of preperation. Use your taunts constantly to trade efficiently into his minions, and use sap when he pulls some crap like core hounds, something expensive. When you have the opportunity, use the gang ups on both a coldlight and a healbot for efficiency. Toward the late game, try to keep a taunt alive, sunwalkers being the ideal minions here. Eventually, the hope is that you can play Kel and start getting some good trades. Take note that Executus may become wary of trading into your taunts once Kel comes out. Also keep in mind that he has enough removal that he can kill kel, so try to bait most of it out.

The end game is to get him to run out of cards, and thus win by fatigue. Try to keep his health at 21 or above so he can't play the giants, at least until you can get a kel / taunt thing set up.from there you can either trickle them out to deal with them one by one, or damage him enough in one turn to summon the firelord. At this point, you really want to be getting fatigue damage in on him, as rag's hero power will be insane and will outpace you if you take too long.

That's that! Good luck guys, and please ask if you have any questions.