This is an obvious combination that is nevertheless difficult to pull off. Counting Houses are notoriously unreliable, being one of the few cards you hate drawing early in the deck. The Coppersmiths are otherwise worthless if you can’t get enough Coppers into your hand. Worst of all, both Actions are terminal, meaning you must draw them together and with +Actions in order to pull it off.
Having said that, the combination of Counting House and Coppersmith is quite powerful. In an ordinary game, Counting Houses can bring in up to $7, and each Coppersmith is worth another $7. (A Gardens deck can bring in even more, as can an opponent’s Mountebank. In both those situations, however, the deck is so diluted the likelihood of drawing into this combo is slim to none.) Actions providing +Buy are probably needed in order to make full use of the money, particularly if the Coppersmiths are Throned or Kinged.