What is a good idea of how many extra cards of each should you keep before you start giving them away, trading, or selling them?A person cannot use the same card in a game twice, can they? So is there any reason to having more than one of each card? Other then for trading cards.I know this is going to sound like a stupid question, but please remember I am just trying to learn all the tips and helpful advice from you more experienced players and collectors.Also what are some of the great cards to have in your collection, I don’t have a Doom card yet, but my little buddy does. LOL