I tried (in vain) for a decent amount of time during Forged in the Barrens to make fatigue warlock work. I found I could cycle my deck quite effectively and yo-yoing health was quite easy. But the win condition of the Neeru Fireblade was too low impact and I often died in fatigue. With The Demon Seed you can burn your deck at will as your win condition starts in your hand, incredible! The idea of killing my opponent with my own fatigue damage I think is amazing. This deck is based on heavy card cycling to rapidly get to the bottom of your deck, tempo out your cards, and use a combination of Mo'arg Artificer and Tamsin Roame for burst healing. Even without combo-ing burst healing, there is roughly 48 healing points in the deck. All that's left is for you tap and fatigue to kill your opponent once you have your questline completed.