I'm trying to come up with a magic system for a "Cyberpunk and Sorcery" game I'm looking to run; my goal is something about halfway between "normal RPG magic" like Zird has in the examples throughout FATE Core and "you would have to be desperate or an idiot to use this" like the system toolkit's Void Calling.
Extra: Evocation magic. The world is full of Powers that you can call upon for aid, if you know how. Sometimes, though, they have more of an effect than you were expecting. Or desiring.
Extra Skill: Evocation. Anyone may take this skill (or possibly even use it at mediocre level if you didn't take it; I'm not sure if I want this or not.) You use it in the usual way, to Overcome or Create an Advantage. Maybe Attack, probably not Defend. If you fail your roll, you can choose to not get what you wanted, or you can choose Encroachment. If you choose Encroachment, you add shifts to make your roll a tie or success (you can't succeed with style), but you take Encroachment damage equal to the number of shift