What's the use of horoscope books?

What is the magic book of the constellation Bili Bili?

The magic book of the constellation Bili Bili is a study of ancient blood cultivation. According to the relevant public information, the mechanism is most similar to practice, which is to remove 1 action card to obtain advanced actions of the same color, but the advanced effect of practice can be achieved without consuming green magic, and the hand card is directly added instead of the discard area of the basic effect, so the magic book of Bili Bili constellation is to learn and practice ancient blood.