Trickster

A mad dog magician is a trickster, a juggler, a jumper.
The Real will flow through any streambed. A mad magician will play with the real, follow it, and ride it down streams both dark and light.
White Magick, Black Magick, the Mad magician knows they are both for fools, and will play the fool when necessary. But he knows that Magick to improve or deprive mortal life is superficial.
Therefore, a Mad magician may appear to be either a benevolent or malevolent creature, or something in between.
There are of course Black and White magicians who are not Mad at all.
These are useless for the subtle Work that must be done by some one.
To do that Work, one must be quite Mad.