It's a fairly simple idea, but it should do alright. What I'd do, however, is drop the novas, heal, and nightmare, add in pillars to get back to 30 cards, and change the deck mark to death for the poisons. Relying on the novas to cast just those two cards is a little too unreliable, I think, and it will make your poisons more reliable as you will always be able to play them.