Them mastery changes.
Halp wat do.
Although the summoner skill surge seems interesting. Testing it out in a bot game as eve cause I wanted to play fizz but some dickwad autolocked him :s
After the game, it's interesting in theory, but the cd is much too high for it to be useful. Over 200 seconds for either a 35% as boost or a scaling AP boost. Much better spells to use.
Okay, so yi is now viable again.
Go 30/0/0 masteries, surge, and some other spell of your choice and make sure to get that fucking +10 damage to towers.
Now you might ask, what's yi's role? Yi's role is to fucking backdoor the shit out of everything.
Dear lord, ghostblade + ult + w + surge can take out towers in under 5 seconds before level 11, it's fucking hilarious. dat yi