Board Thread:Questions and Answers/@comment-26569219-20151222152743/@comment-25968376-20160106163815

Sure, but most of the mission 3 ones are just like that; they require you to have specific sets of treasures. You can do other missions in the meantime to get 100 stars, which will grant you 100 crystals. Use these to buy the 6+1 Supreme Treasure Set and hope for the best. We're probably overdue for another Better Chances of Getting S-grade Treasure event soon.

Since you have an Antique Magic Pot already, you could try pairing it up with another treasure that may generate coin flowers.