Extract from Darkness doesn't target a creature card. You choose which card you're putting onto the battlefield as it resolves. You can choose any creature card in a graveyard at that time, including one just put into a graveyard by Extract from Darkness. If there are no creature cards in graveyards at that time, Extract from Darkness simply finishes resolving.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.