"Newcomer-2011. Summer"

This is easily possible. The spell Raise Dead, mana, and over the first six days you can farm, sacrifice leftover monsters, buy more skeletons, and the Dragons will fall. =)
Using the rest of the army as meat.

There is a much easier way — Gosha with a starting stack of 130-150 skeletons + feeder zombies breaks a Dragon Fly Hive for 6-8 Ducks or a Griffin Conservatory for 1-2, then it's a matter of execution, by week 3 having 10 Angels or 50+ Ducks, + a feeder will take down any ГО, its strength lies in the starting stack, and with experience it becomes even more imbalanced.