If you want more immediate feedback, I suggest you post cards on Discord:
https://discord.gg/PzrKdDFGpuI think Corgi has a bit of a tracking issue. You can usually tell how much money you have by looking at the cards you have in play. Corgi messes that up because your Copper gets trashed, but you still got +1$ from playing it. This can be easily fixed by making it mandatory: «
When you play this, trash a Treasure card you have in play. If you did, +1 Coffers.» This would make Corgi anti-synergize with Bank, but I think it's a good fix.
Destiny's Cottage seems dangerous even if it discards instead of revealing. Donald X. tells us that it's not good to let players accummulate a lot of Coffers:
http://forum.dominionstrategy.com/index.php?topic=19203.0 Coffers tokens were also problematic; when you have a giant pile of those tokens, it's pretty demoralizing for the other players, and sometimes it's even a good strategy. So only one card gives +2 Coffers each time it's played, and some only sometimes produce +Coffers, and some do it when-gained. Villagers tokens had no issues. Go ahead and get a bunch if you want.