Mulligans
Control Warlock with a potentially powerful late-game win condition. Fel Lord Betrug + Plot Twist allows you to give Hakkar rush and therefore prevent him from being transformed before he can die. 1 Augmented Elekk allows you to shuffle even more cards into your deck before you Hakkar. Aranasi Broodmother has synergy with Sense Demons (which helps you find Fel Lord Betrug as well) and Plot Twist , making sure you stay healed.
The removal package here is pretty simple, with the cool twists being Curse of Weakness + Doomsayer or Mossy Horror. Due to Shriek being a discard effect, I wanted to include Soulwarden in case Plot Twist gets discarded. Reckless Diretroll might be worth it, but High Priestess Jeklik might dilute your deck too much. But thanks to Arch-Villain Rafaam, that could even become a good thing. Those 3 are the ones that could be cut the most.
Once Hakkar, the Soulflayer is dead, you can play Arch-Villain Rafaam, turning the bloods into an advantage in fatigue and transforming cards that are bad in the late game into Legendary minions.
Is this idea too convoluted, or will it actually turn into a viable win condition? Only actual testing will tell.