Nice

I think you may want some Megantic Slivers in there.

Ryozake: I agree but it looks like he's going for low mana cost cards here. Predatory Sliver and Sinew Sliver are enough to compensate I think. I'd suggest Muscle Sliver but it isn't Modern legal.

Calvin warning hit it right on the nail, trying to maintain low cost creatures otherwise megantic would be a great choice.

I would try to add in Collected Company. I don't know if you'd like to cut Aether Vial for it but CoCo would hit almost every creature in your deck. That being said you may not want to if you want to run Sliver Hivelord and Sliver Legion because you may potentially put them on the bottom of your library. Homing Sliver could be a solution to that though, or you could cut Hivelord and Legion altogether or even just move them to your sideboard. Also Leeching Sliver, Venom Sliver, and Sidewinder Sliver are good cards to consider.