Nerf one LCS champion with a single change
Take any champion prominent on the LCS scene this season, and nerf/change one thing about one skill that you think would drop it down from a top tier pick. Try not to name something someone else named. It can be your favorite champion or your most hated, doesn't matter as long as it's being played in LCS. I'll begin;
Janna: Howling Gale - Janna now must stay in place and channel to increase the storm's size, rather than it growing on its own.

Windwall instead of infinitely blocking any projectile til it wears off only blocks x amount before breaking. IE 1 at first rank, 5+ at max
Towers still hit Fizz while on Trollpole. That way tower diving actually still actually threatens him.
Abilities cost Energy instead of resourceless. No more spamming abilities mindlessly. Also make Ult cost energy twice, once to activate for the steriod boost, another to shoot execute.
Death Ray deals 33% dmg to minions