It is based on returning units to the deck and calling other units from the deck or hand to replace them, especially during the battle phase and often by putting cards from the hand into the soul, gaining an advantage with high-powered attacks. Then, as of G Technical Booster 1, the keyword Charge is added, a state which forces rear-guards to return to the deck in exchange for greatly increasing their power or additional effects. The clan often exchanges defense for more offense.