Don' know what the market (i.e. how many bidders) would be for Mayfield if he were to be had, but aside from looking like a fairly awkward wide-legged skater, Mayfield is a big, tough SOB who plays the game any way it comes in all three zones. You skate towards him and he'll start defending by using his long reach to pokecheck. If you get by that, he immediately puts on the body. He can be a real handful in the corners and in front of the net, and I can't remember seeing forwards get by him once he puts on the hurt.
He's a righty shot and whereas he's basically just a 20-point defender, many of his assists are fantastic - as in the result of surprisingly strong vision and timing. Whereas his first pass was once questionable, it's become one of the solid aspects of his game the past two seasons. There are teams in this league where he'd surely be more than a 20-point Dman.
But aside from the snarl, aggressiveness, and righty shot that are of general interest to most teams, he's an absolute fixture on what has been one of the best PK units in the league. He eats so many lanes and shots and attempted passes. He's quick to hop on rebounds. He's the go-to defender for the Isles on the PK.
In essence, he's the perfect #5 RHD warrior for a long playoff drive.
And he has the experience of getting to a conference final Game 6 and then Game 7 in back-to-back years.
When you see what a Ben Chiarot got last spring, one can't help but wonder what a guaranteed minute muncher with the prerequisites stated above would mean for the GM of a contender whose team is missing just that kind of thing.