The gameplay boards summed up in one gif

Look, Ryze is not as powerful as you say he is. He's currently sitting at rock bottom of the winrate list next to Azir and Kalista. According to your match history, the problem is that you built too little magic resist. Since you were playing Renekton, I recommend Spirit Visage then Maw of Malmortimus. When it comes to trades with him, try to stand behind your minions so his Overload can't hit you. Additionally, pull back a little if you see him use his E on a minion so he can't spread the flux to you. When he's running low on mana, then you engage. If all else fails, call for a gank.

RWBY THIS SUNDAY for those who are cheep and dont have the Roster teeth membership