Magic in UA reminds me a bit of Sorceror, with the whole "you can do huge things, but it''l cost you" idea.
Each character is tied to a demon. That demon can do things, but it also needs things. The idea is that whatever it is that you want, you always could get it, it's more a matter of what it costs. I tried to run a pbp once, but people didn't really get it.
I hear Dogs in the Vineyard did the same thing, but it's more of a Western thing. Instead of magic you have guns. If you use them you'll probably win the conflict, but you're supposed to be sheriff-type dudes in pre-state Utah, so just killing everybody is a problem. I mean, youcould, it's just not as satisfying.
I just read up a bit on Dogs in the Vineyard, and it sounds fucking amazing.
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Or, you know, you could just use them to make your linens smell unspeakably evil.