Xata, Grand Elder of Heveter

Whenever you play a creature spell, you may look at the top card of your library. If it's a card with the same converted mana cost, you may play it without paying its mana cost. If you do, repeat the process. Otherwise you may put that card into your hand.
{3}{g}{g}: Sacrifice Xata , Grand Elder of Heveta. Search your library for up to 3 creature cards and put them onto the battlefield. Then shuffle your library.