Revisiting and tweaking the 12 removed cards is one of my favorite things to do! Finding a way to change them while keeping the core mechanics (price and execution) the same is challenging. Here is what I've come up with:
Glutton (Feast Upgrade): Plays essentially the same early game, but late game it can be a great $5 cost gainer. Have never tested this, so it may be too strong. Includes the state Hunted, which just plays a card X amount of times (in this case, it plays Glutton once per turn for each Gold you revealed).
Lumber Camp (Woodcutter Upgrade): Identical to Woodcutter, but now if this is one of your first two gains, they become permanently cheaper by $1 coin. A very small change, but I think it makes it a lot more interesting. Woodcutter on it's own was fine power wise, so I couldn't buff this too much.
Adventurers (Adventurer Upgrade): This now draws stronger and stronger Treasure cards each play until it stops functioning. I personally don't thing pure, Treasure drawing works well as a concept, but I do think this version is a lot more fun.
These may not be great cards, but they were sure fun to make. What cards have you come up with?