User blog comment:Doctursea/Summoner Passives/@comment-3450702-20121028123948

I'd like there to be an additional mastery tree for stuff like this. Something along the lines of: "2 bonus magic damage on attack" or "reduces the cost of items in store by 1/2/3%". But 4 mastery trees would probably look a bit ugly. Anyway, it's a good idea IMO.