Yay I won!
I tried not to say much about my own card when it was being discussed, but I'll add a few thoughts now. I designed Collector specifically in response to the competition, and had not shared it elsewhere. The basic idea is to combine two things that normally can't go together--a draw-to-X card, and a lab. At some point, I had considered making it draw-to-5, or having it discard a treasure for $1. But I like playing the treasure because it inspires you to make use of all those alternate treasures in Prosperity. The Collector-Quarry-Workshop combos probably aren't actually that common, but they're fun to think about.
I have no particular attachment to the name. I was thinking Collector as in a coin collector.
I was surprised how much people discussed the interactive part of it--where each opponent may discard a card. Mostly I thought it was a cute interaction between players, and you know, put those wherever you can.
I haven't tested it, so I'm not sure how powerful it is. However, my instinct is that if I had the choice to nerf or buff it, I would buff it. The main point of comparison is Advisor, which can hurt you if you only have a few, but can draw your deck when you have a lot. Collectors are similar--if you have a few they act like cantrips, but if you have many they're like cheaper labs. However, Collector seems tougher to pull off, since you need a more treasure-dense deck, and it might just choke on three greens. On the plus side, it has the usual draw-to-X synergies--native villages, warehouses, villas, etc.