Greasy Fork

You should add a feature to auto-replay all completed Heroic Missions starting from the last completed and working backwards until all energy is expended or the player eventually reaches Campaign 1-1. So basically once the player triggers it, it checks the players highest completed campaign mission then checks if all 3 of each Heroic campaign mission has been completed for the day working backwards.

This algorithm is not suitable for everyone

Then make it an optional "Other" like with Buy Souls. Give the players the option to do it from the highest to the lowest or lowest to the highest. Although I don't really see the case for playing lowest-to-highest, it could still be a different option for them. A third option is include a Settings feature that allows the player to pick what chapter campaigns they want to auto-replay (like with titanite). On second thought, that might be better. The player can set their own Min and Max campaign missions.