Who thought that after more than 5 years all the ridiculous strategy had been already found?
I Srid of Sridonian hereby declare myself as the inventor of a new stupidly effective strategy:
I present to you the Plantomancer™ !!!

It works best with a Half-Dragon in Ick Swamp, but I think it can be pulled off in other places as well, with the help of Mystera.
The Ick Swamp setup allowed me to easily get that lvl 1 double-boss-kill...
Video coming up, as soon as I get a decent wifi, which might not be before next week...
EDIT: Aaargh, I'm on the train, so I only managed to upload a low quality screenshot. I'll upload a better on along with the video
We made an expansion and it is awesome. Really, you should check it out, especially if you're looking for some extra challenge.
Download over at ddmod.weebly.com!