Kenjaku, Minds Swapped

Whenever a creature would go to the graveyard from the battlefield, you may return it to the battlefield attached to Kenjaku instead. Kenjaku becomes a copy of the attached card and the attached card loses all card types. You can only have one creature attached to Kenjaku at a time.
If you would put another creature onto Kenjaku while it’s already attached with a creature, return the original attached creature to its owners graveyard and attach the new creature.