"you'll have an easier time with items of greater rarity" not true at all. Events are blatantly rigged and you can't do anything unless you pay actual money for it. You can still get rare and legendary stuff through the events, but it's not worth the effort. As soon as you activate your shadow ability or it's ready, you'll be stunlocked until you die. And in the most recent event that gives the enemies random buffs, you'll just be even more frustrated than you already are