mtg best booster box for commander Masters with 20 cards per pack Wizards of the Coast Magic:

COMBO I U (TURN 1) Fluffal Bear + Fluffal Wings: Kch hot Fluffal Bear's effect bng cch discard n v t Toy Vendor ln sn

The most striking feature of this book is obviously the human face, which is clearly a reference to the idea of anthropodermic bibliopegy: the practice of binding a book in human skin

In these sets you get upgraded versions of some of the investigator cards that were in the original big box i.e

One tier down, at level 3, Wizards has placed Personal Tutor, a more restrictive tutor that can only fetch up a single card type, and Drannith Magistrate, a stax card that's easy to remove but stops players from being able to cast their commanders