How do you manage to get mythic 7 without opening 3 gold boxes in the market? And to open it, you need 150 crystals. Can you share your experiense what actions do you take for it as F2P?
I did not spend the 150 gems for that quest. You have to log in several times (10-15) a day to maximize your boss fights to get as many tokens / day as you can. The main problem is time. It also helps to have research combos ready at the start of the event to clear those first few quests so you're not waiting for them early.