Interesting variant, Monk. I was afraid to exile my yard with Seance, but raising a wayfinder or soothsayer will actually fill it. Thanks for the advice.
Edit: I think decks around here often include too many expensive cards and not enough mana. I tested the deck as it was for a while, and while I've never lost because I flooded out, it has problems if it ever misses a land drop before turn 4-5 or if it's colour screwed. At the minimum I'd drop the second Rune Scarred Demon for a plains, and I'd probably go ahead and drop the Horror for a 2 drop as well. Brain Maggot is definitely a good addition.