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 you control would leave the battlefield, you may put it on the bottom of your library instead.
At the beginning of your upkeep step you may search your library for a sliver creature and put it onto the battlefield tapped and skip your draw step for this turn.