Hello! This is a generated snapshot report for Tribes in the popular collectible trading card game - Magic: The Gathering. The analysis is done by looking for tribes within each expansion and core set. A tribe of cards is a particular creature type, cards that can produce creature tokens up that type and a group of cards that reference that type (generally but not explicitly supporting that type).

A tribe is supported if it meets three criteria:

1. Creature Count (10) - The tribe must contain at least 10 creatures to be considered supported. For the purposes of this analysis and for simplicity, cards that generate tokens are considered creatures regardless of their underlying type
2. Common Creature Count (3) - Of the creatures in the tribe, atleast 3 must be at common. This is a signpost that the type is supported within a limited environment.
3. Reference Count (5) - There must be atleast 5 cards within the set that reference this type within the card's Oracle Text.

These criteria are not precise, and the values assigned to them have been tweaked empirically in a way that the tribes it identifies are roughly in line with other resources that identify tribes within these sets

We assigned a set a Tribal Score based off of the percentage of cards within that set that fall within a supported tribe - or act like a wildcard (ex: Shapeshifters). That score is normalized against the peak (which is generally regarded to be the Lowryn Block).

Sections:

• Top 20 Tribal Sets - How "tribal" are different sets?
• Tribal Trends - How has the usage of "tribal matters" mechanics faired over time?
• Largest Tribes - Which tribes are the most supported?
• Recurring Tribes - Which tribes occur most frequently?
• Most Snubbed Tribes - Which creature types get printed frequently but do not appear as supported mechanics?
• All Sets/All Tribes - Raw listing of all detected tribes

Links:

• Reddit Thread - Any questions or feedback on the approach can be tossed in here
• Scryfall API Documentation - The Scryfall APIs and data resources are what power this report under the hood. These are high quality, invaluable and highly recommended
• Chartist.js - The two charts generated in these reports leverage the fantastic Chartist APIs to render
• Github Source - The source for generating the project can be found here. The implementation of a golang data model for the Scryfall might be interesting, the HTML generation is pretty bad :)