Oath of Druids
Vintage Masters — mythic
Enchantment
Oath of Druids rulings:
2009-10-01: The ability can only target an opponent of the current player.
2009-10-01: 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 doesn’t resolve if it’s no longer true at that time.