Enchantment, 1W (2) At the beginning of each player's upkeep, if that player controls fewer lands than any of his or her opponents, the player may search his or her library for a basic land card and put that card into play. The player then shuffles his or her library.1
Illus. Mark Zug
The check for the number of lands in play is made at the beginning of upkeep and this ability does not trigger if the condition is not met. The condition is also checked on resolution and the ability does nothing if it is not still true. [D'Angelo 1999/06/01]
The land card goes into play under the current player's control. [D'Angelo 1998/06/15]
Shuffle your deck only if you search for a land. [Barclay 1998/06/10]
You do not have to find basic land card if you do not want to. See Rule G19.4. [D'Angelo 2001/07/14]
Exodus
(Rare)