This is all I remember, there could be more. But he has a limited list of unique artifacts that he wants. He does not take every blue or better item.
The real question is how many of those items you need to feed him to keep him happy or at least to keep him from exploding. He can certainly have the spectator snack, Idol of Silvanus you can probably steal after all is done in the grove with minor consequences, other stuff is kinda useful and I don't want to feed it to some hungry wizard.
