Best counter for zed and trundle

As far as Zed goes, I don't know. I'm not a midlane main.

As far as Trundle goes though, Trundle likes long fights, a champion who can go in for a short trade and get out safely like for example. The thing about Trundle is that (almost) nobody is able to 1v1 him with his ultimate. You can bait out his ultimate, gtfo, and go back in as soon as the duration is over. He has trouble waveclearing quickly, so if you play something like Sion, push the wave and then TP to bot, he won't push the wave very fast, or will propably lose a lot of gold if he follows your TP

trundle is weaker when you have on your adc

ban zed is best counter