Oath of Druids
Enchantment
Oracle Text
At the beginning of each player's upkeep, that player chooses target player who controls more creatures than they do and is their opponent. The first player may reveal cards from the top of their library until they reveal a creature card. If the first player does, that player puts that card onto the battlefield and all other cards revealed this way into their graveyard.Rulings (2)
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Wizards of the CoastThe targeted player controlling more creatures than the current player is a part of the targeting requirement. A player can't be targeted by this ability unless it's true, and the ability doesn't resolve if it's no longer true at that time.
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Wizards of the CoastThe ability can only target an opponent of the current player.