Clow Cards

The Clow Cards are the masterwork of Clow Reed, 52 magical spells sealed in the form of Tarot-like cards. They have been unleashed as a result of Sakura Kinomoto breaking the seal on the Book of Clow.

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Powers
The powers of the Clow Cards vary widely. Each card has one primary power as described in the card's name. When a card is unsealed, it can manifest at any time as a semi-sentient magical spirit and create havoc as it unleases its effects on the world around it. A sealed card will activate its spell at the cardholder's command. Cards are self-aware, although only a few have the capacity to speak and interact with humans.

Sealing A Card
A Clow Card must be sealed in a specific fashion. It is not nearly enough to defeat a Clow Card in battle, and some will not even engage in normal combat. A card must be identified, its name spoken aloud. In some cases, the card's physical manifestation must be drawn forth intentionally; the card cannot be sealed before its manifestation appears. The card must then be sealed by the Key of Sealing or other magical means.

Clow Cards will choose who earned ownership of the card by floating in front of the chosen wielder. This is not necessarily the person who did the actual sealing, but often whoever played the largest role in identifying or defeating the card. Cards can be given to others who know how to use them, and can also be stolen from posession.

Final Judgment
When all 52 Clow Cards have been sealed, all those with cards in their posession will be subject to the Final Judgment. The one who passes the Judgment will be the sole wielder of the Clow Cards. Failing the test, however, could have drastic consequences.