The one buff Lux needs to be viable

So... Lux was one of the first champions I bought back in 2014 and I really enjoyed her, until she just became not worth it.

I decided to give her a try again on my smurf and she feels awful to play right now, despite those buffs she got this season. I even wonder if there’s a reason to pick Lux when Xerath, Ziggs and Vel’Koz exist.

Let’s start with her issues:

1. she’s one of the few mages with a single AoE spell if we don’t count her ult;
2. said above spell costs 130 mana at max rank and deals less damage than Xerath/Ziggs spells (and it could even be ok considering that it’s also an aoe slow);
3. she doesn’t have reliable waveclear, because her only AoE base spell is garbage at clearing waves. Seriously, this is her biggest issue imo. Her E damage is pitiful and you can’t kill casters until you get at least a full item and lv 9, whereas Xerath or Ziggs can just spam Q for less mana and insta-kill casters at lv 7+.

Just give her bonus damage to minions. Like, her E deals 120% damage to minions or something like this (even tho it could be too strong at clearing melee minions too, just an example).

I’m pretty sure that Lux would be in a decent spot if only she could clear waves like every other meta midlaner. Think of Syndra or Ori, they can clear waves with QW at level 7, but Lux isn’t able to do it and gets pushed despite being a mage (supposed to have a decent waveclear).