The Dolphins had just missed the playoffs for the fourth consecutive season in 1989. Hall of Fame coach Don Shula eventually started discussing trade options with Raiders owner Al Davis, and one of these trade options included Marino. The two actually came to an agreement, according to a 2010 piece in the Miami Herald. It did not specify trade details, but said that Davis confirmed that an agreement was made.
The only reason why a trade never happened is that Shula reportedly upped his asking price on Marino twice after verbal agreements had been reached. Eventually, it was too much for even Davis to pull the trigger. And so Marino played the final decade of his career with the Dolphins.
But this wouldn’t be the last time Oakland narrowly missed out on a Hall of Fame quarterback.