Thanks. Do you mean like a “Batlle” card game (cards with values) or like a Magic the Gathering card game (cards with rules on them).
Combat breaks down to one fighter choosing a move from their list to attack with, rolling to see if they hit, then their opponent choosing a move to defend with, rolling to see if they block/soak or deflect and counterattack. Roles are reversed and you go back and forth until one of the fighters' Power Level hits 0.