I noticed today that there is a law that requires children’s toys (including card games) to be safety tested, which can cost thousands of dollars. The Game Crafter says that you can’t sell children’s games with them for that reason. (Note that I have not found official costs for child safety tests for card games.)
Information about the law can be found here. I am thinking Crazier Eights does not violate the law (even saying it is for ages 10 and up) because it is not primarily made for children and could be considered to be a “general use product” for that reason. Crazier Eights is not made to be primarily used by children 12 or younger.
Even so, I could consider saying the game is for ages 13 and up to make it clear that it is not primarily intended for children.