I have made the following web page, which displays and organizes all the game’s spells. It also includes information on what spells each hero class receives for free as level-up rewards (note these class spells can be used by any class). These are based on the game data and are fully accurate.
Note that the spell damage numbers aren’t quite right, as I haven’t figured out the exact formula the game uses.
Gary is also developing a Discord bot which will allow you to access this information as well.