Board Thread:General Discussion/@comment-25855974-20160607210358/@comment-8-20160607233955

I would say that one tactic is to stop being easy to mess around with! I'm guessing that every time he appears there is a big fuss and flurry of attention towards him and his latest tricks. That's not going to discourage him. Better is to block the account, revert any damage, and otherwise ignore him.

A range block won't help if he is changing IP randomly, but if there are other patterns to his editing then you could write to us via Special:Contact and someone will look at options. But block/revert/ignore is still your best tactic.