Which units would you like to replace/add?

Remove the dragons from the seventh level (they are completely uninteresting), increase the number of Harbingers to 7, and leave the Death Knights at level six...

That would be a very good option! :)
Because the dragons are just awful:smile18:. And they are not even beautiful.
It would also be great to replace the zombies with someone else:smile54:!
It's even hard to make them cannon fodder.