These different ratios come about because when Japanese sets are brought into English, the English set is not a one-to-one translated copy of the Japanese one
There is a light sacrifice theme peppered throughout the deck
Special art variants feature flame embossing , making each rare card visually unique
They all depict "Baxia, Brightness of the Yang Zing"
The archetype from a design perspective is full of magical librarians (the regular effect monsters) who summon the characters from their books (the ritual monsters.) The deck so far is lower powered than other ritual archetypes like Nekroz and Drytron, but there are more Libromancers on their way in the "Dimension Force" set that could make the archetype truly flourish
Some people have figured out that when this is combined with the Scoop Up Net card, which puts a card back from the bench into a players hand, the two cards can be used together to draw several cards repeatedly in a single turn