Automation - source folder change


I was very, very excited to know that automatons are here!
First thing I was planning to implement was sending me notifications when someone from our team moves an item from one folder to another. Somehow being aware of what is going on in the board without having to intentionally check the Activity Log section felt to me like a natural thing to want all along.

I tried to set up this automation, but I couldn’t find the ‘Source Folder’ attribute in the list of available triggers. Can you please tell me how I should set this up?