You could always add in the emissary. between Emmissarry, Nix, rats, Hamelin, stolen, ratcatchers, and rat kings there are a lot of models to spread blight. Rats can be very effective as the opponents don't like to cheat fate against 0/0/1 damage. Merely having 2-3 rats on a single person can add up since they add +1/+2/+3 Blight on their damage, helped out by their ability to increase their final flip total.