So this one might be a long shot but I can't help but see potential here. Hitting a Griselbrand off this or Emrakrul just seems like game over.
It has a playable casting cost at R2 which is very easy to speed into play. Having to put it on a creature is a definite drawback but it wouldn't be hard to hit a one drop or even tokens that shift into something massive. Also the fact that all the non-creature cards are getting put back into your library takes away the factor of possibly decking yourself and say you hit Emrakrul everything is getting shuffled back into your library anyway and you could continue the loop.
I just can't help but see some potential here for some fun shenanigans. It might not go into any deck currently, maybe an interesting oath deck? Or it might be possible to just make a new deck around this. Tell me what you guys think. Thanks.