Quote from En Sabah Nuri have to say it... ssSPAWN MORE OVERLORDSss... will be your 5 color sliver
Might as well just staple Sliver Overlord and Sliver Queen together to an extent:
"Slivers you control get +1/+1
At the beginning of your upkeep, put a 1/1 colorless Sliver creature token onto the battlefield tapped.
: Search your library for a Sliver card, reveal it, then shuffle your library and that card on top."