Hmm... I personally would say you couldn't do it that way. If you drained them once, then restored their points, then cast it again I think that would work. I think it's arbitrary though at the description doesn't rule out what you are doing. If someone else casts restoration while you are...
EDIT: I'm rewriting this to include what different options I am going to suggest to my DM as ways to make the Master of Masks prc more useful.
So, I'm looking at creating a new character for a campaign a friend of mine is starting up. I love the concept behind the Master of Masks is a...