OFFICIAL RULEBOOK

Your deck must include at least 60 cards, not counting your starting hero. Your hero starts the game in play, and it isn't considered a part of your deck. You can't include more than four copies of a single card in your deck unless that card has "unlimited" in its type line. You may include any number of unlimited cards in your deck. Some ability cards can only be used by a hero who has a certain talent spec. Those cards will have "[Talent Spec] Hero Required" in bold in their text box. You can include only cards that share one or more trait icons with your hero in your deck. Some neutral cards don't have any trait icons. You can put those cards into any deck.