So when Pantheon gets reworked (assuming he will be in the assassin update)
For the love of god, kill his fucking brain damaged Q spam that requires zero skill and auto wins lane vs melees if he doesn't get ganked. He is such a binary mess and the counterplay with him is to simply "not die and hope he doesn't ult somewhere else." He's one of the worst designed champions in the game while having one of the potentially coolest themes. Keep his ult, that's interesting and make his passive fall off or give it to him as an active somehow so he can't just keep it on and basically laugh at the idea of you trying to fight him.
He leaves you with almost no options in lane. If you're counter picked by pantheon, the game basically just became rock + paper + scissors and you were paper while he's a fucking chainsaw. The game shouldn't be played like this and I hope you plan on removing this shit.