So along the lines of what greenking is saying, there are a lot of LD cards that offer creature removal as one of their modes. You might consider running some. In red black off the top there is wrecking ball, king mentioned befoul. A considerably worse option would be something like Into the Maw of Hell. That way if your opponent does play a creature, it isn't going to kill you by default.
Permalink
I was looking at High Priest, but I wanted to keep my 1 costs around 12 for Proclamation. I think he might be a consideration over Disciple of Griselbrand, but I was paranoid about having no sac outlet on board.