This deck is built upon The Witching hour, so from the very beginning you have to keep drawing cards until you will eventually find one of those beauties. In order to speed up the process I added a couple of tricks that will help you removing the opponent's cards, and even putting them into your void while devouring them. My preferred combos are indeed:
1-
Madness Devour
2-
Madness Ravenous Thornbeast
3-
Piercing Grief +
Devour
On the other hand, you might want to keep drawing cards using
Dark Wisp and
Cull the Deck. I would also suggest to remove some of the opponent's spells using
Devastating Setback to put in play a
Memory Dredger that will give you the ability to draw from your void a
Dark Wisp or a
Lethrai Ranger.
As you can see it's most likely that sooner or later a
The Witching Hour will come up eventually. As a mono faction deck this is pretty fun to play with, let me know if you have any suggestion or improvement that will be worth to apply to it.
P.S. I didn't splash in a merchant because in this case I think that it's not so easy to exchange a card with the market and also because
The Witching Hour doesn't work when it's in the market.