Hmm, artificial dyne water using blended Apple-family recipe alcohol? Maybe run it through a fountain that sprays water on Discord? Na, I think running the Diamond Dogs is much more likely. Oooh, maybe Agatha can recruit Fluttershy in breeding a species of ferret that can detect Changelings (ala the wasp weasels that detect the presence of mind controlling wasps)? Fluttershy might enjoy making such a big impact.