Text (UL+errata): As an additional cost to cast ~this~, sacrifice a land. ; Search your library for a land card and put that card onto the battlefield. Then shuffle your library. [Oracle 2009/07/08]
Sacrificing a land is part of the play cost of this spell. [Barclay 1999/02/09]
You do not have to find a land card if you do not want to. See Rule 701.14. [D'Angelo 2001/07/14]
Vintage tournaments (see Rule 911) have restricted this card since 1999/10/01.
Legacy tournaments (see Rule 912) banned this card from 1999/10/01 until 2004/09/20.