Whenever a green nontoken creature dies, that creature's controller may search their library for a card with the same name as that creature and put it onto the battlefield. If that player does, they shuffle their library.
10/4/2004 You can choose not to find the card.
8/1/2008 If the creature was only a creature as the result of an animation effect, its controller still gets to search for a card with the same name. For example, if an animated Still Life is put into a graveyard, its controller gets to search their library for a card named Still Life.