Sadly, a search of the local Craigslist has yielded zero results for ox. Perhaps a team of Clydesdale or the tractor.
Jon, the ground I grow in has been overworked for some years before I started planting trees on it. In some spots I can only dig several inches before hitting the hardpan. My plan is to break up the layers, then plant a N fixing cover crop. Hopefully the roots of the cover crop will further break the soil apart, as well as, choke out the prairie weeds which are growing. Then turn the cover crop under to add organic matter to the soil.
I won't get to use it until next week. I'll find a way to strap my camera to it.