Light level could dictate health like each light level or just level equals say 10 HP. Individual cards like a 300corrective measure or a 331 word or Crota dictate how much damage you do. There could be cards that help you with your abilities. Say every guardian card has their grenade and super abilities that charge every so amount of turns. Orbs of light cards and such could help reduce the turns until cool down is over. That's just my rough idea