Mutants and Masterminds RPG Trade On The TigrisFor 3 6 players. 60 90 minute playing time. Ages 14+ The Tigris River winds through the cradle of civilization, providing food, water, and a means of transportation for trade and dissemination of ideas between the various cities and towns along the way. In trade on the Tigris, you are one of these cities. Each round, you gain development cards that provide new abilities, produce resources (in the form of cards), trade them with the other players, and