The New York Mets and Miami Marlins are not opposed to making trades together. In a ten-year span in the late 1990s and into the new millennia, the two teams made several transactions. For the Mets, they managed to swipe away four incredibly important players from South Florida.
The Marlins are an organization best known for trading away its players. After winning the 1997 and 2003 World Series, the franchise underwent rebuilds. The rebuild after 1997 was much more crippling to the franchise.
It was after this historic championship the Mets and Marlins began a tradition of moving veterans for minor leaguers.