The List

Oath of Lieges

At the beginning of each player's upkeep, that player chooses target player who controls more lands than they do and is their opponent. The first player may search their library for a basic land card, put that card onto the battlefield, then shuffle.

Exodus

During each player's upkeep, if that player controls fewer lands than target opponent, the player may search his or her library for a basic land card and put that land into play. The player shuffles his or her library afterwards.