The Stygian Blade

When The Stygian Blade enters the battlefield,
you may search your graveyard, library, or
command zone for a creature named Zagreus, Underworld Prince, put it onto the battlefield,
and equip The Stygian Blade to it.
Equipped creature gets +2/+1 and "Whenever
this creature attacks or becomes blocked, it gets +2/+2 until end of turn."