Face Hugger

Acidic Blood (If a creature deals any amount of combat damage to this creature, it gains a - 1/-1 counter.)
{2}, Sacrifice Face Hugger, give attacking or blocking creature a -1/-1 Embryo counter.
(If a creature is reduce to 0 toughness with an Embryo on it, create a 2/2 Black Alien Drone creature token)

"If you find a survivor you think is impregnated? Kill them. And if an egg-layer gets onto your face?
Do yourself a favor...And kill yourself."