From an article on their trading reputation
Raysy trades are:
Trading a moderately expensive big leaguer for a whole bunch of less expensive big leaguers or potential big leaguers—spinning one year of club control into 18 or so—even when the Rays themselves are competing, not rebuilding;
Somehow sneaking into a three-party deal to pick up an infielder or reliever, seemingly without giving up anything at all and perhaps without anybody noticing;
Getting a so-so first baseman or DH for hecka cheap because those types of guys are always getting squeezed off other rosters;
Or making tiny trades from areas of depth, usually for someone that offers more flexibility.