I sort of mentioned this previously -- and LastFootnote seems to have partially confirmed it -- but it seems that is will be difficult to really plan a deck around a specific Prince strategy, in the following sense. If you want to King's Court a Mountebank, you get one of each and do what you can until they collide. In the meantime though, you'll play the King's Court with Villages, Smithies, or whatever other card you happen to draw it with. But with Prince you'd probably just play it immediately with whatever you can as soon as possible. This seems to make the card extraordinarily swingy. In fact, it may demand more flexibility from the players, since even mirror matches may suddenly diverge quickly when I Prince a Militia and you Prince a Smithy.