Shield of the Righteous | Magic: The Gathering
Formats Shield of the Righteous is Legal in
Official Oracle Text for Shield of the Righteous
Whenever equipped creature blocks a creature, that creature doesn't untap during its controller's next untap step.
Official Rulings for Shield of the Righteous
5/1/2009 : If the blocked creature is already untapped at the time its controller's next untap step begins, this ability has no effect. It won't apply at some later time when that creature is tapped.
5/1/2009 : Shield of the Righteous's second ability doesn't track the blocked creature's controller. If that creature changes controllers before its old controller's next untap step, this ability will prevent it from untapping during its new controller's next untap step.