His only viable solution is to become a tank and hope people attack you. 300 gold to make a champion's ultimate useless is kind of absurd. His Q becomes his only damage tool, as maintaining auto attack range is basically impossible to achieve safely in any aram.
But without it he is insanely broken.
So what do you suppose should be done differently?
That's only if you don't know how to throw and bounce them into minion waves. Mushrooms are not only mines or traps after the change, not knowing that is your own fault
Idk, While I agree that teemo feelzbadman with 
existing, he's just one of those champions that is on another level of cancer to play against. He's honestly in the same echelon as 
if elixer wasnt around , The fact that even if you are crushing a teamfight, say your team kills two of them right off the bat, you can't persist and clean up the fight and take the tower because you goddamn know there it 10 shrooms sitting on their side of the map. So basically the other 3 can run safely to their tower while you are having to clear shrooms. followed by throwing a shroom as the wave comes in to clear it. (this applies especially at your tier 2 tower)
He's still very stong imo, (and I know we both play at the same level of play.) But aram is a game of teamfighting, pushing/sieging and most importantly - taking towers. Even with oracle....taking towers against him is still very hard, he has decent wave clear especially with the R range buff. Now I'm not saying that he is as good at all levels of play but right now, he has about a 64% winrate in aram even with oracle existing. Also just the fact that since the howling abyss is a smaller map, proportionately teemo covers a greater area of the map. Picture if teemo could place TWICE as many shrooms (half the charge time or something) on summoner's rift. OF COURSE riot would nerf teemo.
Even if it feels bad to have your shrooms cleared, it feels even worse for the person who stepped on one and lost half their hp on a map that you cant recall and heal on. And it's not like he can't throw shrooms into the enemy team during the mess of teamfights or anything
Here's source if you want to see current aram winrates, cuz teemo is still doing very well for himself:
When I get Teemo in ARAM I always build him on hit. Lich Bane first and then Hextech Gunblade, Nashors Tooth and Guinsoos is a really op core build for Teemo is ARAM. It still gives your shrooms decent damage and you will also own anyone in a 1vs1. Your Q and 1 auto attack will take nearly 90% of a squishies health.
Even worse on Rift, because Oracle's Lens is free.
Just had a game with Teemo in Aram. 3 Enemies build oracle.
You are quite useless for the team then. 300 Gold to Hardcounter the whole champ ist just to broken. At least limit the item to 1 per team.
You might as well say that Jhin's unviable because of it. Both have range. Teemo still has his blind, poison, and MS boost. Not to mention that you can force minions to break traps.
His only viable solution is to become a tank and hope people attack you. 300 gold to make a champion's ultimate useless is kind of absurd. His Q becomes his only damage tool, as maintaining auto attack range is basically impossible to achieve safely in any aram.
I will leave you with this https://www.youtube.com/watch?v=Mwg-30cH79Y :)
Unless youre ridiculously bad, if youre relying on his shrooms to get any work done, the oracle shouldnt have much of an effect on you at all.
Just his q, if you build properly is ridiculously op and can counter any of the champs you want gone desperately... especially jax, yi, or tryd.. I have no issues even if the entire enemy team builds oracles. The only problem you face is the frustration of the enemy team hitting the shrooms so you wont be ksing anyone elses kills, (boohoo!). and most melee chars will set them off before they actually can hit them, if you bush them right, anyway.
Whats more annoying is the champ visibility with oracle.
