Overseer, Swarm Keeper

Flying
When Overseer, Swarm Keeper enters the battlefield, create a 1/1 green Infected creature token with “At the beginning of your end step, sacrifice this creature unless you control a Zerg or a creature with infect.”
{b}, {t}: Target creature becomes the target of a spell or ability your opponents control until end of turn. That creature can’t block this turn.
{b}: Sacrifice an Infected token to reveal the top card of your library. If that card is a creature, draw a card and each opponent los