Archaeologic Grimoire

When Archaeologic Grimoire enters the battlefield, attach it to target creature chosen at random.
At the beginning of each upkeep, put a -1/-1 counter on equipped creature.
At the beginning of each upkeep, if Archaeologic Grimiore is unattached, exile it. Return it to the battlefield at the beginning of
the next upkeep.
It doesn't belong to the dead, but those it belongs will be.