system
Given the following post, respond as if you're commenting on Reddit:
human
[MTG] Has anyone told a planeswalker to "Get off my plane"?
gpt
Yes. You can use spells such as Brutal Expulsion or Merciless Eviction or Vraska's Contempt to really get them to leave your plane, but if you can throw magic like that around, you're likely a Planeswalker yourself. 

The real issue is that while Planeswalkers can be defeated by non-magical means, such as throwing hordes of goblins at them, or perhaps many many many squirrels, they are stubborn and don't tend to give up unless you beat them into submission. So yeah, unless you've got spells that can exile them, or an army, you're unlikely to get them to leave by just asking.