Fixing Coppersmith

I like the idea of the card Coppersmith a lot, like probably most people do, but the card simply is way too weak both in terms of reliability (Coppers plus itself as Stop cards while being terminal) and even the Payload is just fine - often ending up as a terminal Gold requiring 3 additional cards.

So I thought about a way to fix it and came to the conclusion that simply making it a Duration helps a lot. It halfs the terminal problem and becomes a stop card only every ither turn. But still i think a corresponding duration card for 5$ "This turn and on your next turn, whenever you play a Copper, +1$." would still be a rather weak card though comparable to merchant ship. I altered the wording of Coppersmith to get money on each Copper play, which buffs its Interaction with Enlightenment and Highwayman.

Then i thought how much a version should cost if it stayed in play like Samurai and Hireling. Samurai obviously is quite similar, but gives less payload while having a useful one time attack. Yet in order to use the payload you still need multiple coppers as stop cards. I think 7 would be a valid price. What do you think?