What are the best magic spells in Fate the game

It is a matter of opinion. Summon Firedrake is pretty good if you like having a tank / damage dealer with you. Area Slow Spell and Meteor Strike are also pretty good, and Muffle Magic is VERY useful at times (when dealing with spell-casting monsters, it'll silence them for a duration of time). Haste is especially useful when you're trying to run away or increase your DPS.