Xenomorph Praetorian

Vigilance, Acidic Blood (If a creature deals any amount of combat damage to this creature, it gains
a - 1/-1 counter.)
You may sacrifice Xenomorph Praetorian: Xenomorph creatures you control gain hexproof and indestructible until end of turn.

"There was one big motherfucker, like twice the size of the others... That thing could really scream. I never heard anything like it."
—Cpl. Tequila