Lots of new players seem to miss, or misunderstand, the bonus rules, and get confused. Of the 31 posts so for on the Forest Shuffle forum, 4 are from people who didn't understand how the bonus rules worked, and some of them thought it was just a bug and didn't realize they did something wrong. Also, when playing the game, I have frequently been asked by other players in the chat about this. Questions like why didn't I get a bonus from playing that card?

Some people don't remember that how you pay for a card determines if you get the bonus. Some people think the cards you pay have to match each other, not match the card being played. Some people think only one of the cards you pay has to match the card you're playing. Some people don't remember that when you get a bonus, the cards you play with it won't give you their own bonus or effects.

Since this seems to be a frequent and recurring problem with people starting to play this game, and since many people don't seem to notice the red X / green checkmark, I think adding this feature to the game will help everyone learn. Once they understand the rules, people can check the "don't show this again" box.