In Black Hack's magic system, the first attempt at casting a spell always succeeds, then you roll after to see if you retain it. The catch is that subsequent roll-to-retain rolls for the same spell are made at disadvantage.
I haven't tested that in Shadowdark but it seems like it could be good. You always get one cast of a given spell, often get two, rarely get three or more. I do worry that it might make casters a little too good, especially at higher levels. Shadowdark isn't balanced around automatically successful spells. It might be necessary to have players know fewer spells -- Black Hack casters only know one spell per level.
I haven't tested that in Shadowdark but it seems like it could be good. You always get one cast of a given spell, often get two, rarely get three or more. I do worry that it might make casters a little too good, especially at higher levels. Shadowdark isn't balanced around automatically successful spells. It might be necessary to have players know fewer spells -- Black Hack casters only know one spell per level.
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