Comment on Blood King: If your opening hand has just a Mangler, the mobs ignore your summoned imps and go straight for the keep, as the summons are not fast enough to keep up, or stop them is they do engaged, this is an auto loose.
For the Blood King: it feels like demolition crew should be the answer for the Manglers, but not being able to use it on original imp squares leads mean you cant use it to replenish your mangled troops, and if you double click, or didn't know it only works on non Imp Squares, you are screwed.