Mythic exemplar (Complete Champion excerpt)

[theredrobedwizard]

Actually, you can qualify for one of the "special" requirements with one level of Marshal.

The other parts, however, do require at least 4 levels.

-TRRW

 

[Corsair]

It's basically the sneak attack and grant allies bonus which which allow early entry. That being said, the class doesn't strike me as terribly overpowering if you get in one level early, especially for the rogue.