Feedback/help on my Discard/Wither MTG deck?

Staff of fugue is great. What you might want to consider is lowering your Mana curve (i.e. getting more one and two drops). A discard deck runs on speed. If you have to wait for 5-6 turns to get going then your opponent will be able to have a mive creature advantage. I understand that you have the dark rituals but it would be must better. You might be interested in switching in switching your dark rituals for cabal rituals. They are more recent and do the exact same thing. Unless you have 7 cards in your graveyard. Then you get 5 mana instead of 3. Otherwise it looks like a good solid deck.