My favourite is JME on “Issmad” from his newest album “Grime MC”.

He finishes each bar with either a number or a letter and makes it rhyme for each bar and makes the number/letter increment each line. Usually changing the number/letter every 4 bars.

Standout bars:

“My booking fee was under 1K

When I started spitting in the year 2K

Feds don’t like me like the 3 Ks

‘Cause I film them and upload in 4K“

…

Also:

“Man are out here tryna make one M

I need a mixdown, send it to(two) M

I go to Yiannimize for the wrap, 3M

So I drive to the cashpoint for(four) M’s

See me on road in the AM

But you can’t keep up in your BM

Man’s a T high streeter like CM

Don’t follow you so you can’t DM“

The effort isn’t needed to make the song a banger (imo) but the extra effort goes a mile and makes me constantly rewind to catch some new bars each time.