Goodwill definitely becomes a problem when more than one is in play. For now it's been reverted back to no +buy.
v2.2: Rancher added and Botanical Gardens changed
Rancher - Action - $6
+3 cards
You may reveal a victory card from your hand. If you do, gain a fruit or cattle token.
When you buy this card, gain an action card costing up to twice the number of cards in your hand.
This card, mulching machine, and city planner are all based on being able to buy cards using fruit tokens instead of cards. They are pretty much different variations on using or affecting the cards which are still in your hand during the buy phase.
Botanical Gardens - Victory - $6*
Worth 4 VP
When you buy this card, you may pay an additional $3 ($6). If you do, gain another (2) Botanical Gardens.
Ideally this card would be a fixed cost + $X, and the more you pay the more VP you get. Trying to balance such a card even as a thought experiment is tough and I can't think of a good way to do it, so this is my alternative.