This is legally gray; Nintendo still argues it violates their EULA. But it is safer than downloading a "top" ROM from the Archive.
Mario Kart 8 Deluxe Starter Guide : Free Download, Borrow, and Streaming : Internet Archive. Internet Archive mario kart 8 deluxe rom internet archive top
If you search today, you might find a "top" result. Search again next week, and it will be gone. This is the . This is legally gray; Nintendo still argues it