Have your other guild members set their formation to 6 Asura and set your formation to 3 Phoenix and 3 Trump Card Pilot. Example below. You’ll win every time and gain Miracle Syrup to help get your desired heroes/new heroes much quicker.
During weekly event ‘gem shop’, it costs 1600 gems per 10 Miracle Syrup. Using the method above, not only to you get your daily freebies, but you can get 10 Miracle Syrup for only 1,000 gems (if you buy additional Challenge Tickets) Not to mention the 10 additional Glory Badges (guild coins) you gain along with it.