How do you get the cards to work in wizard101?

In Wizard101, cards are used during battles to cast spells and summon creatures. To use cards effectively, you must first choose a school of magic and build your deck with spells that complement your strategy. During combat, you draw cards from your deck and can play them based on your current power points and the game's rules. Make sure to balance your deck with offensive and defensive spells to enhance your chances of winning battles.