Aegis, Shield of Chaos

Equipped creature has "Whenever this creature attacks, tap target creature defending player controls. If that creature
has greater power than this creature, put a number of +1/+1 counters on this creature equal to the difference."

Equip {2}

Aegis, the Shield of Chaos, predecessor to the very Aegis wielded by Lord Zeus and by Athena, his most favored daughter... the Lord of Thunder defended his brothers and sisters using that very shield when, together, they conspired to drive the Titans back i