It's actually been a while, I haven't been able to get out in weeks due to exams and other things but last time I played with a similar deck I went 2-1. I am still missing the 2 Mogis for the deck, using Ogre Battledriver instead but I have play tested against mono black a fair bit and it does ok after side-boarding
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I don't think that is Standard right now but it is a nice idea, thanks.
For the sideboard I would suggest eyes of the skies instead of seller because you still get the bird but you can then populate any other token that you need. Also instead of Bountiful Harvest use Hero's Reunion, its only 2 mana and gets you 7 life every time
I would suggest taking out Liliana Vess for 2 toxic nim, a 4/1 infect with {B} regen cost could hurt alot
Dream Twist is also a good card for any mill deck. 1 blue with a flash back of 1 blue and a colorless for 6 cards gone