With these trade details, the Rangers would've gotten Stamkos for a steal. While players like Del Zotto, Callahan, Dubinsky, and Girardi are all solid NHLers at the time they do not stack up to the impact that Stamkos has had.
With this trade, the New York Rangers could've changed the course of several NHL dynasties throughout history. The most obvious change is of course the Tampa Bay Lightning most likely do not win the two Stanley Cups that they did.
Of course, this is all just speculation based on a trade proposal lost to history. It would be fun to see an alternate dimension where Steven Stamkos brings down several of the NHL's greatest modern dynasties. Unfortunately, we will all have to settle for the reality of Stamkos staying in Tampa Bay and creating his legacy there.