I would consider going with 1-2 more dispises, maybe in place of inquisition. A turn one dispise>extraction on a Jace or other key planewalker really mess up a deck. Also, you might consider getting rid of the dismembers for a couple of mind sludges. Mind sludge is such an underestimated card, especially in the current format, and double especially in a deck with 24 swamps. Finally, the mana curve could be a bit higher, you're running 24 lands with a ton of 2 drops. Adding in 2 grave titans or even a couple of sheodreds could swap in for 2 nighthawks.
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Is 24 mana too much with this mana curve?