The existing Article Blamer tool in Xtools doesn't work; see example below. This is a big, hard task that seems beyond the scope of the current Xtools project. There is an existing WikiBlame tool that works for at least some queries.
Question for the team: We're going to pull Article Blamer out of the Xtools project; we can launch successfully without it. Should we put time into building a new Article Blamer?
From the Miss Piggy article on enwp, looking for this edit by Jedi94 from 11 Oct 2015:
Search term: Kermit, however, constantly rebuffed Piggy's feelings.
Existing Xtools Article Blamer tool finds the wrong edit:
Wikiblame finds the right edit: