Comparing him to the Warrior, the Wizard seems better skilled toward long range attacks and wiping out masses of enemies with destructive spell casting. The Wizard has supreme control over the natural elements with the ability to rain lightning, conjure flames, violent tornadoes and waves of pure energy. Of course, with all great powers, comes drawbacks as well. Your power is limited to a mana pool so you will have to use it wisely. The Wizard happens to be the most fragile of the heroes and he will not stand very long should he be overwhelmed!
Check out the video yourself to get a preview of what the Wizard can do: