How's your book?

Max Book level is lv 8.

To get them is the following. Note the number is the amount of monsters you have cards for, not for every single card you collect

1 0～10 Red
2 11～30 Orange
3 31～60 Yellowish Green
4 61～100 Green
5 101～150 Sky Blue
6 151～210 Blue
7 211～280 Purple
8 281～ Black

So you need 281 different types of monster card to get the final level monster book.

Thanks! If it wasn't straight count, my next guess would've been with some weighted system based on card rank.