Thank you Aquila and congratulations to the runner-ups!
Before I start the next round I would like to give some insight about my thought process that lead to Carpenter. Most of the specifics I have listed in my original post.
In my playing group(s), when new Expansions (or sometimes fan-made cards) come in, before we play the recommended sets or even go full random, we pick 2-3 new cards and combine them with relatively simple cards from the Base set, and a round or two later also with Intrigue and Seaside cards. With this approach, the Base set is over-represented in such games, also simply because that box contains all the basic supply cards. During those games, we miss a cheap +Buy card more often than not.
I also thought about creating a card associated with Curses, because there are 30 in the box, but only one card that cares about them. I couldn’t find an elegant way, and rejected this possibility, but NoMoreFun has found one! Kudos for that! I also think that LastFootnote’s version would have been perfect for the official 1st Edition of the Base set, but unfortunately the real Chancellor and Woodcutter still exist and and some people are still playing with them.