The Brethren Moon

{b}{r}{g}: Target opponent creates "The Black
Marker", a legendary artifact with protection
from everything and "During your upkeep,
sacrifice a creature or lose 10 life."
Whenever a non-Necromorph creature dies,
return it to the battlefield under your control. It's
a Necromorph in addition to its other types.
{b},{r}, or {g}: Regenerate this creature