Oracle Text

Search target opponent's library for a creature card and put that card onto the battlefield under your control. Then that player shuffles their library.

Card Rulings

10/4/2004 You put the creature onto the battlefield, so you control it and any “enters the battlefield” abilities it has.
10/4/2004 Because the “search” requires you to find a card with certain characteristics, you don’t have to find the card if you don’t want to.