Embryo Storage

{t}: Add {u} or {b} to your mana pool.
{b}{u}{t}: Create a 1/1 black Worm creature token
with deathtouch.
{b}{u}{t}: Create a 0/1 black Facehugger creature
token.
{b}{b}{u}{u}{t}: Create a 3/3 black Xenomorph
creature token.