I highly recommend you to put in some more lands and remove Coastal Tower. Mistral charger sucks balls :D
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What do you think about the number of lands? Maybe there are too many of them?
I highly recommend you to move Jace from side to main deck ;)
Only lands have more than 2 copies each o_O
1 cancel? Is that a joke?
If I may suggest something: add max quick slivers and max virulent slivers. You can base on green color - it has a dozens of abilities that allow you to add mana from any color, for example land enchantments such as Utopia sprawl, fertile ground. Gemhide slivers you included are pretty awesome too.
Nyxathid doesn't have fear/flying, so I decided not to include him. Wit's end is expensive and useless especially in 7th turn. But thanks for advices anyway
Priest of gix would work pretty awesome in this deck. And cabal coffers are pretty useless when you've got only 17 swamps