The owner of this deck hasn't added a sideboard, they probably should...
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Still changing the deck around, using it in 2v2 and 3v3 games where my team members are using other colored sliver decks.
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If you are worrying about cutting counter spells add 2 Isochron Scepters to the deck along with 2 Boomerang. You could probably cut a Spell Pierce, a Divination, and a Preordain to make space. If you are going to go 2 color in the deck, green and white are your best choices. Green gives you Muscle, Might, and Gemhide(Very important if you go 3 color), while white gives you Plated, Sinew and Crystalline to improve your deck. Most Sliver decks work best when grounded in blue but have access to three colors to optimize the abilities. Also Changelings count as slivers so you can add some extra abilities if you have any of those sitting around. Coat of Arms should be in your sideboard if you are playing a none tribal opponent I would also drop 1 Synchronus Sliver as it is too expensive for what it gives you.
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Adding green would help stop psionic sliver from killing all your creatures with that ability. Since this deck is creature dependent, you might want to consider adding muscle sliver and/or might sliver from green so that you can use psionic sliver as much as you want. Also with shifting sliver in play, this would help you kill the opponent faster since your creatures are bigger and cannot be blocked. I would prefer sliver legion over coat of arms, since it does the same thing but only for slivers, however you do not play with the land generation that this requires, unless you add the gemhide slivers like geezer48 said (which I completely agree with if you decide to add green). And if you do decide to add those it, this gives you a multitude of other color options if you are interested.If you just want to stick with blue however, consider some of these:Mesmeric SliverMistform Sliver (changelings work disgustingly well with this)Mnemonic Sliver (same idea as psionic sliver in that you have to kill your creature, but it's a draw engine)I love slivers and have a deck of my own. Let me know if you'd like some more advice. :)