Infinite Authority | Magic: The Gathering
Formats Infinite Authority is Legal in
Official Oracle Text for Infinite Authority
Whenever enchanted creature blocks or becomes blocked by a creature with toughness 3 or less, destroy the other creature at end of combat. At the beginning of the next end step, if that creature was destroyed this way, put a +1/+1 counter on the first creature.
Official Rulings for Infinite Authority
10/15/2006 : Moving the enchantment after the ability triggers will not affect which creatures are affected.