I am trying to set up the following rule.
If List "Doing" has zero cards assigned to me
Then
Move the topmost card assigned to me in the List "This Week" into the "Doing" List.
This will then allow me to hide all the lists on my board except for the "Doing" List (using the chrome extension Trellist) and whenever I complete a card by moving it from "Doing" to "Done" the next one I've already prioritized in the List "This Week" will show up in the "Doing" list I have.