When Argothian Wurm enters the battlefield, any player may sacrifice a land. If a player does, put Argothian Wurm on top of its owner's library.1
Illus. Kev Walker
2/1/2007: When this enters the battlefield, first the active player gets the option to sacrifice a land. If he or she declines, the next player in turn order gets the option. If a player elects to sacrifice a lang, this is put on top of its owner's library, but then all remaining players still get the option. If all players decline, then nothing happens and Shivan Wumpus stays on the battlefield.