Iron Knuckle

Living weapon (When this Equipment enters the battlefield, create a 0/0 black Germ creature token,
then attach this to it.)
Equipped creature gets +5/+5 and has trample
and "You control equipped creature". When
Iron Knuckle becomes unequipped from a
creature it's owner gains control of it.
Equip: {6} — You may equip Iron Knuckle to
your opponents creatures.