1/3 lands in edh is passable with the cheap mana rocks and ramp but with the standard card pool I think you are going to miss your 3rd land drop a lot more than you like with only 20, and most of your 2 drops are removal and not advancing your board. I don't mean any offense, just offering advice
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You need some more land, my dude
I've been experimenting with a Grixis Control deck that's fairly similar to yours in that the blue is mostly a splash but I do have a few questions.1. Why cinder barrens over canyon slough2. Why not have a couple of lilianas to synergize with champion of wits discard?3. For having a maindeck with 9 sweepers and a lot of spot removal and a sideboard with even more, what is the plan against traditional blue based control