If you're playing 1v1 Commander, you should follow the
French Banned and Restricted list. This is the most commonly used guideline for 1v1. Then tell him his general is banned
Or you can use effects to prevent him from searching the deack like Stranglehold or Leonin Arbiter. You can go with prison type effects to prevent him from attacking like Ghostly Prison or Propaganda. You can always just kill his general with infinite choices since it lacks hexproof.
The real question is how does this guy run his deck? I'm guessing he voltrons up Zur, which makes the prison effects not very useful (although Peacekeeper can be fun!). If he doesn't play with a lot of other dudes, edit effects are going to be very strong no matter what enchantments he puts on him. I played a Zur deck before he was banned that did not rely on a Voltron strategy. I would search out combos like Rest in Peace and Energy Field and more often than not win with Helm of Obedience with that Rest in Peace in play. Mine actually ran very few enchantments and had a heavy control element to it.
TLDR version: It's harder to suggest how to beat him if we're not sure what he does.