If you have auto-play you definitly want to complete this each and every day. This battle is the biggest source of GOLD in the game racking up 3 to 5mil gold each day and a good number of 3-4 star ISO-8. You get a lot of 1-2 star as well but I always sell those cause its a waist of Gold to use those for ranking up ISO-8. I only use 3 star or better for ranking......