You will randomly draw three cards each turn then select which hero to get them from. Use different strategies for different fights. For some, you may need to use buffs on a single hero in order to attack a single target. In other cases area of effect damage cards may be more useful to hit multiple enemies. Use heroes that are the most useful, such as those that can cause the best damage. Try to do damage first and take out as many enemies as possible. Start with high damage cards and on taking out as many enemies as possible with them. If you are facing a large number ton of enemies, consider setting up a totem to take damage away from your character.