Menace, deathtouch

Whenever Zerothul, Coral Grave Devourer deals combat damage to a player, mill five cards. Then you may put a creature card from among those cards onto the battlefield under your control tapped. That creature is a black Zombie in addition to its other colors and types. At the beginning of your end step, if three or more creature cards were put into graveyards from libraries this turn, draw a card and lose 1 life.