I finally get to show off one of the core ideas of this game that inspired me to make it in the first place. I thought it would be fun to have to take the positioning of your units in mind when using spells as a team. Basically, if you cast a spell in team mode, that spell will be created above each of your teammates that's within the casting range. This will determine the AOE you're working with, and you can take advantage of that to attack multiple spaces at once in whatever formation your units were originally in.
This isn't quite the idea I originally had for the game, but after I started development this implementation made more sense and is a lot more flexible than what I had in mind at first. I'm excited to come up with scenarios to encourage this type of play, and even more excited to see if it's fun for players to experiment with!