I wanted to get some other opinions on the Glamour ability in a game I am about to run.  It looks like there is not a system in place like regular magic and sponsored magic.  How would you restrict the willie nillie use of this power when it does not seem to cost anything to cast?  I was going to rule that it works just like evocation so that there is a mental stress added to a character using this ability so that it does not become over powered.  Opinions?