Blue Cards are given to the Digimon Tamers. They were part of the Digimon Project by the Wild Bunch, and Shibumi was responsible for releasing them into the world. Blue Cards are used for power-ups or to digivolve a partner Digimon. (See also the Tamers pages under Digivolution.)
Blue Cards are activated using Card Slash (aka Digi-Modify). Card Slash is also used with normal cards.
|Right: Rika uses Card Slash.|