I think you play that guy with divine shield and spelldamage in control warlock. It makes defile way better, works with your mortal coils and soulfires.
You play 2x doomguard, 2x void walker and the new 5 drops demon and maybe malch imp as your demons. You don't want to run many discard cards, soulfire and doomguard is all you play, these are just good.
You play warlock legendary card not because it's good but it's the best minion with lifesteal you can play. Maybe add one of those 5 drop 4/4s for redundancy too.
Now corpsetaker can gain lifesteal, taunt and divine shield. Rest of the cards the usual good cards in handlock, I don't think hellfire is necessary and you don't want to play anything that damages your face. Mountain Giants depending on the meta.
You play Jarraxus and Guldan. Guldan basically hopefully summons 2x doomguard and taunt, for burst and stabilizing. Depending on the match up you play one that fits and you can always override Jarraxus with Guldan to get your hp up or add burst. That's all the top end you need.
I think it could be tier 3 something like that. That's what I've been thinking so far. Maybe Reynad is right. Handlock did work when Un'goro came out but after mage become popular basically it was impossible to play it. Maybe if burn decks fall off. Pirate warrior is more winnable than mage.