Do you want this to be a mono black control deck that just happens to have faeries in it, or a "classic" fae tempo deck?  

I would cut the Dark Rituals and maybe add Hymn to Tourach instead; Dark Ritual is awesome turn one to instantly just cast either a Nighthawk or some discard stuff (Hypnotic Spectre back in the day!) but all it really does long term is give you card disadvantage. I also think that since you're monocolored, the fetches don't add too much and will hurt you a bit long term since you're using bitterblossom as well.