To help with recovery from AW, or Massacres...

at WD, Mystics would receive 25% of the Wizards (room for debate on what % would be the 'right' number) from ALL Non-Mystic's within their KD, spread evenly over the Mystics. Wizards in excess of Max Population go back into a pool and are divided evenly back over the Non-Mystics.

My initial thought was to have Wizards as a KD resource during CF only, which can be sent only TO Mystics. This seems more complicated from an implementation point of view though...