Ask HN: How do you deal with power grabbers?

There's this new guy at work who has no clue about the codebase or the business cases and is just trying to impose his cargo cult Scrumban process to look good to the top layer. It's very clear he wants to move up quickly while not doing much work himself and delegating stuff he's incompetent at.

In general, how do you deal with people who are clearly just interested in power grabs at work?