How can mice fight food wars without star cards?

According to Baidu's query, the way to get a star card without using a war rat is as follows:

1. Shop purchase: Get twelve constellations through in-game shop purchase.

2. Task reward: You can get twelve constellations by completing various tasks.

3. Activity participation: Participate in various limited-time activities, and you can get activity rewards for completing tasks, which may include twelve constellations.