Imperial Settlers: 3 Is A Magic Number is the second Empire Pack for Imperial Settlers. This expansion introduces a new rule: SET. This new ability allows players to score and trigger new effects each time they build 3 cards in a particular color, so called SET. With that rule drafting phase and choice of a right card to draft is even more interesting! Expansion includes new cards for the common deck as well as new cards for each of the five factions, and two new cards for use in the solo game.