User blog comment:LivesByProxy/Mastery Redux & Game Design Theory/@comment-24333627-20160121000257

Overall, I feel like these masteries have a bit too much of a noticeable effect. Masteries in their current form are meant to give some power to champions without their opponent having to worry about much more than the Keystone mastery. Spreading that power across 7 different masteries is a mistake. With a mastery that gives mana regen 2.5 times that of Morellonomicon for free at level 1 (Meditation), a mastery that lets an Irelia with 3 items ult twice in a 9-second period (Sorcery), a mastery that increases the duration of Kayle's E, Vayne's ult, or Olaf's ult by 33% (Runic affinity)... That's just way too much power for something as hidden as a mastery.