Eternal Servitude

Creatures your opponents control get -1/-1.
Whenever a creature you control dies, create a
2/2 black Zombie creature token. Creatures target opponent controls get -2/-2 until end of turn.
{1}{b}{b}, Sacrifice a Zombie: Return target
creature card from a graveyard to the battlefield
under your control. If that creature has converted
mana cost three or less, also create a 2/2 black
Zombie creature token.
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"...Even death doesn't last forever..."