Hello I have noticed that MG sword : Bloodreaver does not add any wiz dmg. Even by stats for wizardly dmg it does not have ( number ) . Mine currently is +7 with 107% wizardly dmg increase. And my wiz dmg is not inreased a slightest!
Just tested it, works perfectly fine. More that doubles Meteor Damage with 152% when sword equipped.
What skill did you use? Wizardry Damage works for Evil Spirits, Inferno, Flame, Meteor etc.