How to prevent your teammate from banning your champion
During Ban Phase, quickly pick the champion you want to play. Don't ban it and don't click any other champion. Your teammates can't ban on whatever champ you clicked. During this time, search for the champion you do want to ban. When the timer is close to zero, quickly ban another champion if desired or just wait until everyone else use their ban. Edit: this is useful for a certain samurai that gets constantly banned. or just any other champ thats gets banned alot