As mage you can spend points on polymorph -> int to increase all magic damage that and scoundrel is all you need. Also mage armor gives higher magic armor, and that really helps as most strong enemies seem to have magical damage, where you can be cced more easily with str builds. Mages can replenish their with shields up while 2h str can't. 1h-shield is considerably lower damage.
It has been agreed upon earlier that the damage increase from 1 point in Poly to boost int is not as strong as 1 point in a magic school to bost the damage with specific elemental damage,at least for a pure mage.For a hybrid the only instance I can think of when Poly is really good is when you are making a geo/poly hybrid,because those points in Geo will buff that medusa head damage really nice,otherwise it's just a place where you can dump stats for your battlemage to get Bull Rush and Wings (personal note:I do use bull rush on my battlemage because it's a mobility skill that does piercing damage and it keeps my teleport and netherswap off cooldown).
