you have nothing to worry about.
you will be one of the fotd Doomcryer characters...
why you want this is beyond me though...
the only thing you gain is an annoying advantage in Olympiad.
and a bunch of people who are mad you can't provide Battle Rhapsody.
so the only reason to do this is for a Olympiad Enforcer.
otherwise you should not go Doomcryer.
they don't have more mp, they don't have better reuse, they don't really have anything but the Damage over time debuff which is nothing special outside of olympiad.
After changing to DC, just dont learn Battle Rhapsody.
Anyway, if you arent in a good strong pvp CP, or a strong pvp clan, if you arent 99 already or have the resources or plans to be competitive on hero at Iss classes, keeping MI instead of taking BR would be more a nerf than a leg up, imo.
Randoms wont care about MI when all they need is a BR to satisfy their needs.