And I must admit
I bring creatine to the scene
Your developmental league don’t see a team

from Wale – W.A.L.E.D.A.N.C.E. Lyrics on Rap Genius

Meaning

Wale is comparing himself to creatine and is pumping up the hip-hop scene, while other rappers are stuck in development and don’t have a team, or can’t get signed.

Development leagues, most known in the NBA (D-League), are venues where athletes can play competitively to develop their skills in hopes to make it to the majors. So basically the minor league

Creatine supplements are often used by athletes to help build muscle

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