Thiefs Knife Rating: 4/10 I do love creatures like Scroll Thief and Thieving Otter
Removing three loyalty counters from him will let you place a number of +1/+1 counters on up to two Creatures equal to the number of colors they are
You can either discard it and return it with Hashaton, letting you acquire a busted draw engine for just three mana, or you can play it honestly later in the game and use its self-exile ability to discard cards and enable other Hashaton shenanigans
With a free sacrifice outlet and some sort of mass reanimation spell, it might be possible to cast Angel of Grace, sacrifice our entire board to something, draw a bunch of cards (while not dying, thanks to Angel of Grace's enters-the-battlefield trigger), reanimate everything to do it again, and possibly add in a way to kill our opponent along the way, like Judith, the Scourge Diva
Thankfully the slumber counters keep it in check for a few turns