I like the idea a lot! I will try the deck but I would take out Mass Dispel, 2xPenance and 2xBone Wraith and I would add one more copy of Dead Ringer (or Plague of Death) and Khartut Defender, 2xRotten Applebaum and N'Zoth, the Corruptor.
You'll have better chances in surviving the early/mid-game aggression by playing one Taunt minion at a time and also push for some face damage too. N'Zoth, the Corruptor will allow you to play the tempo-loss Emperor Thaurissan turn and of course heal you to full for some time after. That way you may play your combo with less combo pieces sometimes or straight up win without it, by adding a copy of Seance for an alternative win-condition.
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