I've had AN THOUGHT to make things as fair as possible.
We keep it like it used to be (at least, how I remember it!) - it's sorted out on the night, mag*cs grab 5, MAGs grab 5 - but - we make it so that if some guys played last week, and there's others who didn't play last week, the guys who didn't get a game automatically get put forward, and the others have to wait a week for their turn again. Keeps a rotation going, means it's not as serious as a match and just keeps it nice and light and doesn't require big organization?
Obviously this relies on both sides remembering to get numbers on, but obviously quite a few MAGs are up for it, so hopefully there's some good MAG*c interest too!