Guild

Builds are currently unique to the Ravnica Block. There are ten guilds in all:

Guild Name	Colors
Boros	Red/White
Dimir	Black/Blue
Selesnya	Green/White
Golgari	Black/Green
Izzet	Red/Blue
Gruul	Red/Green
Orzhov	White/Black
Simic	Blue/Green
Rakdos	Black/Red
Azorius	White/Blue