Q: In Seven Dragons, you can choose to skip either the Action’s effect, or it’s color change. Can you choose to play it and do neither?

Can you choose to skip the Action AND put the card at the bottom of the discard pile?

A: Well, if you dislike all of your options, you can always pass. That’s legal. However, if you play an Action card, you can’t just waste it – you must choose at least one of the options. So if all you want is to pass, then just pass.