iMtG Server: Gathering

Slivers G/R 67 cards, 7 sideboard 4 {Sliver Hive} 10 {Mountain} 10 {Forest} 24 lands 4 {Virulent Sliver} 4 {Megantic Sliver} 4 {Homing Sliver} 4 {Gemhide Sliver} 4 {Manaweft Sliver} 4 {Thorncaster Sliver} 4 {Striking Sliver} 4 {Venom Sliver} 4 {Predatory Sliver} 36 creatures Sideboard 2 {Diffusion Sliver} 1 {Sliver Hive} 4 {Crystalline Sliver} 7 sideboard cards

{Belligerent Sliver} and {Blur Sliver}. You can expand to include all color of slivers because, you have {Gemhide Sliver} and {Manaweft Sliver}. So look into that :)

If you have the budget, a set of {Collected Company} could be pretty strong, here.