Non serious suggestion:

Mediator

It is in Monstrous Compendium Outer Planes Appendix
No page number because it is one of those that was binder pages, so you could make your own super book.

It casts Wish at will, and can do so reflexively without actually stating anything.
Sure, it is only in service to maintaining the balance of Nirvana, but that can be hand waved with infinite wishes - maybe the Snarl was attacking it, and he got away through the Astral via a wish?
It also has no XP value listed, as it cannot be defeated.
All scenes can be explained with wish.
Mediators can't normally talk, but then wishes.
The Ecology section not making sense? Hand wave with wish.
You can do a lot with enough wishes.

Yeah, it is silly and bad. But if you can get rid of the nonsense reasoning of it even being here, the power set technically matches.



Although I still really think it is the Grue from Wishbringer (or at least a version of it - maybe it became an Eurg which could explain the tower and earthquake scene) - I just can't find a stat block for that version yet, and I have been looking for a while now.