MCC is an invitation only CS League. Basically, you need 3 MCC teams to sponsor your admittance into the MCC.
What makes MCC fun is that you play against clans you normally play with while playing on one or more of our community servers. The primary servers I believe are [Mmmm]Platinum T3 and [DOH]Foxtrot OC-24.
There are other servers in the community that belong to DLM, Th3Fall3n, S!d, DW, CsLs, etc.
Play on any of those on a regular basis and contribute to the overall fun of the games and I don't see it being a problem getting 3 sponsors.
Good luck!