Using the earlier example of Mana Vault and Izzet Signet, a fast-mana deck under Rule of Law needs to choose between casting their mana rocks and casting the things that those mana rocks would normally allow them to, like interaction or threats
At the start of your main phase, it lets you dig through your deck and impulse draw cards based on how many colors you control
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
There is even a lifegain deck in this format to take advantage of that ETB trigger
Blue craves knowledge, and structure is key to research
It eventually found its way to Sheldon Menery, who wrote an article for the popular trading card site and store, Star City Games