[Hawkmoon]

I have been playing almost non-stop with the occasional break for work, sleep, family and food but me and my friends have a gentleman's agreement to not use Iron Dragons. Are these units insanely powerful? I mean for the measely price of 25 Earth Gems you get a nearly unstoppable killing machine...what am I missing? Is there a chink that I'm not exploiting here? Are they easily killable with a few item combos? Help us out so we can add this untit back into our games please....