Infinite Authority

Enchantment — Aura

Enchant creature

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.

Infinite Authority is on the reserved list, which means WOTC has self-imposed restrictions from making functional reprints of this card.