Use a deck containing all your partners, reverse sevens, speed sevens, mystic sevens, Rosemon's lure, any other option cards, de-armor digimon, Forgot the name, but the thingy that allow you to digivolve to C and U while in A, and any other good idea you could have and you cannot lose a battle (great, the reverse sevens could help you recover strong discarded cards, speed sevens if you have low HP, mystic sevens in case of a dangerous option, Rosemon's lure to prevent strong cards, de-armor digivolves in case of trouble, substitute with Warp-up digivolve) Also, NEVER put Fake sevens on a deck, in an all-or-nothing gamble it could be fatal, take care of the pick up deck, some people say it's easy to win, yeah, it has a poor balance of digimon, but a strong arsenal of options, so challenge at your own risk.