Have you considered the Ravnica Double-lands?
Azorius Chancery , Boros Garrison , Dimir Aqueduct , Golgari Rot Farm , Gruul Turf , Izzet Boilerworks , Orzhov Basilica , Rakdos Carnarium , Selesnya Sanctuary , Simic Growth Chamber

Also Galerider Sliver over Winged Sliver - Costs 1 less mana

Sorry, didn't realise you had Galerider

Tunnel Vision and Patriarch's Bidding / Living Death

just another way to bring out a lot of slivers. Tunnel Vision target Patriarch's Bidding mill your self and put a lot of sliver's into your yard. Then cast Patriarch's Bidding and bring them all out.

I'm running both right now because I always like to see flying. Are you thinking just Galerider Sliver ?

I love the idea of Tunnel Vision ! I'll start searching for some, thanks. I have a Living Death , right now it's not being run because I want to flip over my whole deck with Primal Surge at least once before I add other non-permanents.

Living Death is a good second choice, but i would recommend Patriarch's Bidding as far as searching for it with Tunnel Vision just because unless there's another tribal deck at the table, it give you a greater advantage.

I run both Living Death and Patriarch's Bidding in my deck though can't hurt lol

You could add a Planar Portal . It will help you get you're Primal Surge faster. Oh and just for the fun of it, you can also add a Possessed Portal .