Look at the top seven cards of your library. You may put a creature card from among them onto the battlefield. If that card has converted mana cost 3 or less, it enters with three additional +1/+1 counters on it. Put the rest on the bottom of your library in a random order.
As Turntimber, Serpentine Wood enters the battlefield, you may pay 3 life. If you don't, it enters the battlefield tapped.