How i would nerf Tristana
Tristana is undoubtably top tier at the moment and heavily contested in every elo (including the LCS, if that counts as an elo, probably not). She is supposed to be a hyperscaling ADC who is bad in the early game, but she is noticeably strong in the early game and a monster in the lategame.
These nerfs look towards reducing her early game power greatly while also touching her lategame a bit.
>Q: Attack Speed increase duration changed from 7 seconds at all ranks to 5/5.5/6/6.5/7 seconds
This would tone down her early-game safety and give her enemies more room to achieve lane-dominance over her and shut her down early.
>W: Removed: Resetting cooldown on kills/assists New effect: Refunding 40/50/60/70/80% of cooldown on kills/assists
This nerf would lower her late-game power by giving her enemies a few seconds to escape once she prepares another jump to take them down.
>R: Damage changed from 300/400/500 to 200/400/600 Cooldown changed from 100/85/70 to 110/85/60
Part of the reason Tristana is so good in the early game is due to the immense burst and safety that her ultimate provides. Nerfing the early-game damage and cooldown should help with this, but giving it a little compensation for lategame should keep her from being hurt too much by this.
These are just my ideas, so if anyone has a different opinion, please share it!