This is how I interpret the rules. There is no limit on the amount of times a spell may be used during a turn or game except that you cannot use the same spell on the same unit more than once per turn. I think the main reason for this is to keep someone from trying multiple times to cast a spell until it finally works. Mike, please correct me if I am wrong.
You are correct Mark. If your user has the MP he can cast as many times as it likes, but you cannot use the same spell on the same unit during a turn...
Didn't Mark just say that :)
Yes I did, but it's Official when you say it
Also, Arcance Shield covers all units for that turn, so you can only cast it once.... FYI.