Thawing Glaciers enters the battlefield tapped.
, : Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle your library. Return Thawing Glaciers to its owner's hand at the beginning of the next cleanup step.
10/4/2004 The land put onto the battlefield does not count toward your one per turn limit because it was put onto the battlefield by an effect.
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.