The House Dimir

 

The House Dimir is the crime organization of Ravnica. They use blue-black magic to steal and cause systematic mayhem within Ravnica.

 

The current Dimir leader is the shapeshifter Lazav. He shapeshifts into any creature or Planeswalker that he wants to.

 

The current Dimir guildhall is Duskmantle, a hidden underground fortress. No one in the general populace and  not many in the Dimir guild know how to get in.