Eminem - I'm The Devil Ft.2pac (lyrics) -

"I'm The Devil" featuring 2Pac is a popular fan-made, non-official remix rather than a real collaboration. It typically blends recycled verses from Eminem's "I'm Back" and various 2Pac tracks over a dark, themed beat.

You can find various versions of this fan-made remix on platforms like SoundCloud or YouTube . Eminem - I'm the devil Ft.2pac (LYRICS)