Paradoxical Genesis

{x}{g}{g}, Sacrifice a creature with converted mana cost X: Search your library for a creature card with converted mana cost X and put it onto the battlefield. Then shuffle your library.
{x}{x}{g}{g}{g}{g}, Sacrifice a creature: Reveal the top X cards of your library. Put all creature cards revealed this way onto the battlefield and the rest into your graveyard.
Life takes many forms with many functions.