All magic should be as light and as easy and as accessible as prayer.

Any magic that requires you to search high and low for "eye of toad and tongue of newt" may be fun for a while, but, in the end, you ask your self what that frenzied hunt was all about. You could have spent all of that time on more important things.

If the materials aren't in your back yard, forget it. If they are in someone else's back yard, then it's HIS magic, not yours.