text: The triggered ability granted by Dragon Cultist looks for the total amount of damage dealt by a single source, even if that damage wasn't dealt all at once or wasn't dealt to the same player or permanent. For example, if an attacking 3/3 creature with double strike deals 3 damage to one blocker in the first combat damage step and 3 damage to another blocker in the second combat damage step, then it has dealt a total of 6 damage and will cause this ability to trigger.