Xenomorph Prime World

{t}: Add {b}{b} to your mana pool
{1}{b}: Spawn a black 1/1 Facehugger creature token with Impregnate
{t}{2}{b}{b}: Spawn a black 2/1 Royal Facehugger creature token with Royal Impregnate
{t}{5}{b}{b}{b}: Go through your deck and choose 1 Xenomorph spell and cast it without paying it's mana cost, shuffle your library afterwards