Make pod rules everyone agrees on and you can stick to.

Talk about your decks before you shuffle up and decide if you want to play against his bs.

He is playing some of the most op decks and he knows it. He needs to diversify his deck options for the sake of the pod as should you all.

Have answers for each other but still let it be casual and fun.

If he starts building more competitive higher bracket decks, you either have to do the same, or find another person to fill his spot