Coppersmith
All six cards reduce your hand size. However, if you have no treasure in hand and no remaining actions, none of them give any other benefit.
The second set of cards listed can reduce hand size with no benefit, but under conditions that have nothing to do with treasure: KC and TR provide no benefit if you have no other actions; Shanty Town provides no benefit if you have exactly one terminal non-draw in hand (really borderline?); Crossroads provides no benefit if you have only Treasure in hand; Ruined Village provides no benefit but it doesn't matter what's in your hand.
All of that said, though, I don't know how Ruined Market and Abandoned Mine would fit, because each provides a (small) benefit.