I remember the olden days when DC’s were based on 10 instead of eight… let’s fix that!
Magic Mastery
You are a master magician. The DC for all your spell’s is now 10+ proficiency + your spell casting ability modifier.
Thoughts?
Daily Punch 5-26-15 Magic Mastery feat for DnD 5e
Throat Punch Games 
I like that idea and would love to use in my homebrew if that is ok?