Yawgmoth, Thran Ascendant

{t}Look at the top card of your library-if it is an artifact or creature you may reveal the card and put it into your hand, otherwise the card is exiled.
{p/b}{p/c}:You may cast a card from exile until end of turn.
{p/b}{p/b}{p/c}{p/c}: Yawgmoth gains power equal to the number of cards you own in exile until end of turn.
Sacrifice an artifact: Yawgmoth gains shadow until end of turn
Sacrifice a creature: Return target artifact from your graveyard to your hand.