There are many things that Y can do  Y can start a discussion on the talk page and ask X to participate  Y can go to an appropriate noticeboard or WikiProject and ask for input from other editors  Y can request that the page be protected  But Y cant do any more reverts  And it is not true that any edit that changes the text is a revert  If you fix a spelling error or clarify the wording or substitute a better source those are not reverts unless you are returning the article to a state it was in earlier  The basic problem is that you are seeing this as a fight and trying to find a place to win  If you are dealing with another editor who wants to fight getting into a fight wont lead anywhere  what you need to do is get help