The design team (Aaron Forsythe, Richard Garfield, Mike Elliott, and Tyler Bielman, led by myself) approached Dimir as the "library guild," much as we approached the Golgari as the "graveyard guild." As I explained above, this comes about because blue and black have more interaction with the library than any other two-color combination
The total amount of serialized cards either has a specific meaning like the 77 golden Traveling Chocobo (from Final Fantasy 7 ) for Final Fantasy , or gets a nice round number like 500
For some spells and abilities, you'll surveil last
A few of these cards would be "Dark Hole," "Raigeki," "Harpie's Feather Duster," "Pot of Greed," "Solemn Judgement," "Mirror Force," and more
return those cards to the hand
The important framing: this is not Japan discounting anything