[TOMT] Trying to find obscure YouTube rap song from ~10 years ago — deep synthetic voice, “my rhyme” possible song title?

I’ve been trying to track down this old rap song I heard on YouTube maybe 10+ years ago. Super short track, like a minute long max. The rapper had a super deep, almost synthetic or edited voice.

The last line might’ve been:

“This is [X], and this is my rhyme.”

The video thumbnail was just a still image of an anonymous/Guy Fawkes mask, maybe black and white or green-tinted (this might be wrong but it’s my best guess). Very obscure — not a famous artist, probably online-only.

When I try to search for this I have no luck at all… sound familiar to anyone?