IMO: the best way to add magic and spells to Cyberspace, is to find an old copy of ... that OTHER light-weight RPG that ICE used to have a license for, back in the 1980's and early 1990's (which I will refer to as MRP) ... it's almost EXACTLY the same game mechanics as Cyberspace, but with a fantasy emphasis (so, where Cyberspace is sort of Spacemaster-Lite, MRP was sort of Rolemaster-Lite). Including spells. It works well as an entry-point to Spell Law if you want to work in advanced spells from there, as well.
From there, everything except "Physical Adepts" from Shadowrun should work pretty seamlessly, at the conceptual level. But, not so much on the specific spell-lists level.