The stability of chess game server and client, the audience of game screen design.Card game in the game can produce a different size, there is a strong and weak points, so in order to prevent the spread of strong cards, basically all the game publishers will use rarity to control the proportion of various intensity cards. The three division is a common way, that is, "ordinary brand", "non ordinary brand" and "rare brand". Take the wisdom card as an example, a supplementary package contains 15 cards, including one rare card, 3 non regular cards, and the rest are ordinary cards.
In order to add some value to the card, the game publisher publishers the special card. The traditional way is "flash card". These special printed cards are very elegant and have great collection value.