You can do it quicker, without creating a smart campaign. In Lead Database, create the smartlist (like you would have created it in a smart campaign). Look at the result and select all leads, and run a marketing flow action (add to list).
Breno, when using your method is there a way to continuesly update the list? As in, when new leads are created who meet the critieria of the smartlist, is there a way to automatically add them to the static list?