Street magics

You are a master of a darker side of magic. Magics in which are rough round the edges, not pure by any means but still magic nevertheless. 

Arcane hideaways

You know thieves cant and can add it to your languages. 

Fast casting

You also gain knowledge of the grittier side of your magics and can cast one first level spell as a bonus action. You can do this only in combat.

Really small writing

You can now learn new spells of any kind for your spell book for two thirds the usual price in resources down to your resourcefulness. 

Multitasking

You might not be the best wizard, certainly not the most skills, but you can do something that these other “real” casters can. You, only out of initiative, can concentrate on 2 spells at a time. However when you do concentrate on 2 spells at a time you have disadvantages on both CON saving throws for each spell. If you have advantage already (Feat- War Magic) then you will just have a straight role on one check. 

Spell sleuth

You can feel magic wherever it may linger. You can use the detect magic spell an unlimited amount of times.