bonafide11
Worker
I discovered this while playing a OCC game last night. Since in OCC games, it's difficult to come up with gold, after I conquered a city, I'd pillage all the territory around it for the extra gold. After capturing an enemy worker, I realized that workers have the "repair" ability on open territory. So you can have a couple workers continually repairing improvements, and a mounted unit moving from one improvement to the next and pillaging it. It takes some micromanagement and it's an exploit, but it allows you to collect quite a bit of extra gold per turn, which is especially useful in a OCC game. The developers should make it so workers can only repair improvements on your territory.