Macedon, France, Egypt, Persia, Germany, Sumeria, Gorgo Greece, Pericles Greece, Norway, Poland, Russia, Spain, Arabia, Scythia, Rome, and England. 16 all up. And don't worry if you accidentally add in one of the others—they'll just get automatically deleted at the start. However, you will want to make sure you do include all 16 (or, without DLC, 13) of the civs I mentioned so that you don't get any empty spaces. Also, increase the city-state slider to 24 and that will guarantee the game will roll all of the city-states, and ensure that you'll get all 12 of the city-states that have start positions on the map. The mod will remove the other twelve. Finally, while I'm at it, Play Europe Again also has secondary start locations for most of the civs so that you can have duplicate leaders. This is especially useful for a second Russia at St. Petersburg, a second Scythia in the Crimea, a second Poland at Minsk, and a second Germany at Vienna, all of which fill in some gaps and balance up the map, and will bring you to a nice round 20.