Mud is just already a pretty easy matchup, I don't think we need a bullet for them. If you want, there is a dragon that gains control of all their artifacts when he hits, but that seems super narrow to me for a matchup that is already favorable. As an aside, dack is hilarious in that matchup.
edit: @pirate, I agree, entirely, my view on archetype is that it allows griselbrand to be that creature in more matchups, by increasing his resiliency.

