How can I get the lucky potion of Magic Domain bb?

There are three ways: the first way is to make a 3-star copy of Batu Hell, which has a certain probability of explosion. The second is the digital activity on the fourth and fifth sundays of each month. The third is the card task of the twelve constellations on Sunday in the first week of each month. It is recommended that you get the lucky potion for the card task, because a group can change ten lucky points, which is faster and more cost-effective.