wow. There is no way to gain multiple provinces in a turn, so it has to be really fast. I'm gonna go ahead and guess Counting House/Beggar/Bank, maybe with a journeyman?
At first I though it was Death Cart/Conspirator, but you would need two ruined villages in hand to activate conspirator, so that doesn't work.
EDIT: wow, after further thought, beggar/counting house/bank sounds ridiculously fast, especially with 5/2. That's got to be it. You probably don't want journeyman, counting house will always be better.