Secret Realm: When to Start Playing Cards

[Semi-original card battle + academy daily + secret adventure] (The card battle rules refer to Shadow Poem (Hearthstone) + Slay the Spire + Full Moon Night + Monster Train) What should a secret adventure be like? Saku Chihaya, a junior at Card University, said: A carefully constructed deck, a powerful native card spirit, and a rich harvest of cards. The most important thing is that fighting is fun! However, after finally reaching the secret realm, he met the fugitive princess of the kingdom. Rebellion, seizure of power... It seems to be a wonderful script. So, when do you start playing cards?