Fighter Mage with Magic Sword introduced spellcasting into the Lost Worlds combat gamebook series. Spells are handled with separate cards — I believe you got a random assortment and could supplement them with a standard set found in The Tome of Red Magic. Fighter Mage here also comes with a magic sword, also on a separate card (I guess you could lose it in a fight or give it to another character?) that does double damage to trolls.

The Lost Worlds books are fun for like the ten minutes it takes to play a battle, but there isn’t a ton of depth beyond that. You aren’t going to play this game for hours on end (probably?) and that makes the investment of buying multiple books a bit steep. But it is still a pretty fun novelty filler game.