Somebody know this song or hopefully artist?

Ok people... i dont have much to go on but he is a black rapper mainly out of the 90's. he had a come back song like two years ago that i want the name to. it featured lots of famouse people like mary j. blige, lil wayne, and others. it was a great song. he has usually really thick dredds (however you spell that) and back in the day did a song with janet jackson and the music video was futuristic with the like bubble effect.... like i said i really dont have much to go on. he's pretty famouse not as much as he use to be but hes like a legend... let me know if you have any guesses, know the answer, or know where i might be able to find out. THANKS!!!