Gonna define the term "rapping dj".
A person who makes the actual tracks that comprise Hip Hop is a DJ. Deeper than two turntables. Two turntables is like freestyling off the dome. Studio production is like crafting a written rhyme over the course of weeks.
So dudes that made the beats and also rhyme? Rakim. Hands down. Since Ra is arguably GOAT just for #barz alone. When I learned Rakim was making the beats too.. I was impressed.
Honorable mentions: QTip. Dilla. Scarface. Havoc. Daz. Dre. Quick. Kanye. Dudes like that are the top tier in this category.