Dual Major

Your interests in the arcane go beyond a single school. 

You can pick a second arcane tradition. As the nature of magic is difficult to fully understand, you are limited to a maximum of 2 arcane traditions at any point. Each time you take this feat, you can extend your knowledge into that second arcane tradition.

For simplicities sake, when you select this feat - 
1st time: Gain the benefits as if you were level 2 in that tradition. ( Requires at least 2 levels in the Wizard class )
2nd time: Gain the benefits as if you were level 6 in that tradition. ( Requires at least 6 levels in the Wizard class )
3rd time: Gain the benefits as if you were level 10 in that tradition. ( Requires at least 10 levels in the Wizard class )
4th time: Gain the benefits as if you were level 14 in that tradition. ( Requires at least 14 levels in the Wizard class )