Oath of Druids | Magic: The Gathering
Formats Oath of Druids is Legal in
Official Oracle Text for Oath of Druids
Official Rulings for Oath of Druids
10/1/2009 : The 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 will be countered on resolution if it's no longer true at that time.