Xenomorph Nursurey

{t}add a {b} or {g} to your mana pool
{2}{b}{t} Sacrifice Xenomorph Nursery, place 4 0/1 black/green egg tokens onto the battlefield with "when this creature dies place down a 0/1 Facehugger with "when this creature dies in combat gain control of target creature, it becomes a xenomorph in addition to its other types."