They soon became a sought after fixture by teams from all over based on a reputation for hard, fast rugby and an aggressive “joie de vie”.

Their reputation earned them respect overseas as well, with touring sides, such as the Glamorgan County RFC, seeking a challenge at top level rugby.

The 2007 season saw the Mystics win their first New England title after twelve years, moving on to take the Northeast Championship in 2008 and a spot in the National Division 1 Sweet 16.

[3] In 2014, Mystic River merged with cross-town rivals, the Middlesex Barbarians, in an effort to develop the game of rugby in the area.

[13] Though officially a member of the Atlantic North Division 1 Conference, the Mystics competed in the ARP and played all teams but Life.

They finished their regular season with a record of 6 wins and 2 losses in their inaugural year in the elite competition, automatically securing a berth in the USA Rugby Championships quarter-final round as the number two seed in the Atlantic North Conference.

[14] A win over the Midwest Conference's number one seeded team would put the Mystics in the Final Four for the second year in a row, against ARP rivals Old Blue.

[17][18] The Mystics would go to play the Western Conference Champions, the Austin Blacks in the USA Rugby Emirates Airline Club Men's Division I National Championship.

The following season the Mystics were able shock the favored Norfolk Blues 36–22 to set up a revenge match with their New York rivals, beating NYAC 26—25 and earning a trip to the 2018 national championship game.

[20] In the final match, Mystic River were able to stay ahead of their Western conference counterparts, Belmont Shore RFC and win their second national title by a score of 25–24.

For the Free Jacks' first exhibition match against Ontario in October 2018, there were 15 former Mystic River players on their roster, including coaches Smith and Kareem Afifi.