Vaal Hazak

Flying, trample
At the beginning of your upkeep, put a -1/-1 counter on target creature, then proliferate.
{2}{b}{g}: Return target creature from a graveyard to the battlefield under your control, except it's a black Zombie in addition to its other colors and types.
{2}{b}, {t}: Vaal Hazak deals damage to target player equal to half their current life total, rounded up.