From the hot anime show, ".hack", its .hack//SIGN Trading cards and the .hackThe World trading card game.
7 trading cards and 7 game cards per pack. 171 different cards and 6 rare cards in the series.
.hack//SIGN Trading Cards: 81 types (including 6 special cards)
The World Trading Card Game: 90 types
List of cards: http://www.happy-pocket.net/fan/hack/card.htm