Mrazek
Muzzin
Nylander
I think this team could use a bit of a shake-up, and we obviously have a capspace problem. Mrazek speaks for itself. Muzzin I think is exactly the type of player we need more of, but I also think he's clearly already on the decline (though he did play well in the playoffs) and I don't think we can expect him to continue to be a top 4 dman anymore. Regardless of whether we keep him or move him, we're not getting prime Muzzin on this team going forward, and he has one of the biggest caphits on the team that could be used elsewhere.
Then Nylander is really one of our most valuable trade chips that is still a bit of a luxury to keep - you obviously are not just moving this guy out the door for the sake of moving him, but assuming you can get good value for him, I think it's the type of shake-up we could benefit from. We need better depth, better secondary scoring, more grit, and more of an ability to score hard physical "drive the net" type of goals in those really tight game 7s. I'd be hoping to move him in a trade for multiple pieces, including at least one with some legitimate top line / top pair upside.
Frankly, given that one of the things I mentioned above was the need for more depth, grit, secondary scoring, etc, there are certainly a few other forwards I wouldn't mind seeing moved (e.g. I'd like 2/3 of Kerfoot, Engvall, and Kase to be gone), but this format only let me choose three names.