If you can, add Jace the Mindsculptor. After all, he CAN exile entire libraries, forcing opponents to use graveyards in place of their libraries. I know it's 5 turns to get his loyalty up to 12, but hell, played early enough it'll work.
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Sliver Overlord, Heartstone, and Sliver Queen are keys to a good Sliver deck. With the Queen and Heartstone alone, in combo with the Gemhide Sliver, it can produce an infinite amount of Sliver tokens.
The only Eldrazi element in this are the Conscriptions. I mean, those can be taken down fairly easily with any control deck. Once those four get Canceled/Naturalized/Ect., they'll just be graveyard padding. Try to put some actual Eldrazi creatures in- I find It That Betrays and Pathrazer of Ulamog work quite nice, along with the lords.