Main suggestion: Get the City of Brasses out and replace them with Ancient Ziggurats. Also, you should probably get rid of some of the AEther Vials and/or your Force of Wills for 4 Gemhides, which are a staple of any Sliver deck. I would also recommend giving up more of your counter spells for Necrotic or Acidic Slivers. I don't see anything else right off of the bat, except that you should probably replace the metallic slivers with some other low-cost ones that have effects.
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