1) Logistics (Golem March), because Razaz is a golem creator, and by the end of the game, he will have about 500 of them (on an XL map);
2) All Dark Magic; Better yet, focus on Summoning!
3) Defense (Razaz's defense is developed from the beginning of the game), so max it out;
4) Education (for mini-artifacts; with 35 education points, you can forge a very good artifact, such as +3 speed, +4 luck, etc.).