Sliver Hive Drone

Eminence - As long as Sliver Hive Drone is in the command zone or on the battlefield it has the following ability:
{4}: Search your library for a Sliver card with converted mana cost X, where X is the number of Sliver creatures you control. Reveal that card and put it onto the battlefield, then shuffle your library. Activate this ability only once each turn.
{3}: Put two 1/1 colorless Sliver creature tokens onto the battlefield.