Chestburster

Offspring(when this creature is birthed, it has all
the abilities it's host had. A Xenomorph creature
spell cast from this creature's Rapid Growth ability also has these Offspring abilities.)
Rapid Growth(when this creature is untapped and without Summoning sickness, you may sacrifice it
and search your library or graveyard for a
Xenomorph creature spell. You may cast that creature spell for it's normal converted cost minus
this creature's converted mana cost. Shuffle your library afterwards.)