Yea, I suggested trying darkblast on like the first or second page...

It seems OK in testing, but it has a lot of negative sides to it. You can't make use of the things it puts into the yard, it can't deal with fatties, and it is somewhat situational.
It could be worth testing, but really only if you desperatly fear slaver and stax and the mirror, and don't think annul is enough mainboard hate for the stax and slaver.