The First, Sliver Genesis

Sliver Convoke (Your slivers can help cast this spell. Each sliver you {t} while casting this spell pays for {1} or one mana of this sliver's color.)
If a sliver would leave the field, you may put it on the bottom of your library instead.
Sliver Call: At the beginning of your upkeep step you may search your library for a sliver and put it onto the battlefield tapped.