I can ask alone, then, for the extra layer of definitely-not-following-Fëanáro.
Options for who to divinely rob. The priest's demesne is basically a temple, hard to pass off as mine. And we might be out of reach of Earth gods anyway. Isadora, the Sphinx, is really powerful and teaches a lot of practitioners. She's an avatar of Balance, meaning karma and rightness, not just by necessity like we are. Problem is I don't know if stealing her library would help, since she predates writing and I think relies mostly on instinct and experience. There's a practitioner serving a spirit of patriotism, I don't know much about that or how useful it'd be if I did.
The best targets would be old families, and we don't really have any of those. Best bet is a certain servant of the Lord of the city. I think the servant part isn't voluntary; he might not even mind being made less useful. He does illusions and enchantment, which would come in handy but doesn't hit very hard.
I have a friend who does astrology, but a lot of her stuff is sentimentally valuable and would probably be useless here anyway. There's a practitioner who works with ghosts but I don't know much about him. Sisters of the Torch are elementalists, would be partly redundant even if they were focused on magic instead of networking.
I actually don't think there's anyone in the city who can do more destruction than we already can.