Surprised nobody mentioned Unending drone. Unless its Infested Scavenger deck(which is not much good anyway), its absolutely useless. If you aim for classical GI mass buffing, you are much MUCH better off using support drones, scouting missions, leftovers from splitter drone, overloaded drone etc etc. Simply worst unlimited ever, i can think of more uses for a tech knight comparing to it.
And lets not forget overloaded soldier too. Its simply laughable, sadly.