he guilds of Return to Ravnica cards are Azorius, Izzet, Rakdos, Golgari, and Selesnya. But because all ten guilds exist on Ravnica, you can sometimes see the influence of the other five guilds.
For example, take Dispel.
Because it's a blue card, Dispel could technically be Azorius, Dimir, Izzet, or Simic. But if you examine the art carefully, you'll figure out which one it really is.