Message:Nope, I don't think I've tried adding free-style magic to horror or heard tell of someone who had. I've seen Conrad's Fantasy used for Good Guys (comic heroes). As long as the Bizarre modifier is climbing on Mixed, Overkill and Mishap, you'd probably have a fun time and temper the power creep. Magic in horror tends to be the preview of cultists and PC on the verge of insanity.
Have fun and let me know how it works.
Here's the sales pitch. The two-page games, like Zen Fantasy are also good for casual players and one-off adventures. Chronicles, Era Ten and Heroes '31, I think are modular. Yet granted I can see where the sheer volume of material and options may overwhelm some Refs and players. None of this is canon; mod as you find logic.
Yours,
IronRed
06-Nov-2021