At the beginning of each player's upkeep, if that player controls more lands than each other player, Rivalry deals 2 damage to him or her.
The goblins revered it; the viashino defended it. Only Urza understood it.
Official Rulings for Rivalry
10/4/2004 : This ability will only trigger if the player controls more lands at the beginning of upkeep. This condition is checked again at the start of resolution, and if not true, then nothing happens.
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