Mike Green is producing his lowest rate of even-strength goals since 2013-14 and a career low in primary assists. (Paul Sancya/Associated Press)

The NHL trade deadline is a chance for contending teams to add a difference-maker?for the playoff push. Among others, New York Rangers defenseman (and captain) Ryan McDonagh, plus teammates Rick Nash and?Michael Grabner, will be highly sought after before the?deadline arrives Monday, and they should?reward the acquiring team with above-average play ¡ª even?if they come at an above-average cost of young players and draft picks.

But then there are deals that come at a steep cost and yield little return. In other words, the kind of trade that teams should avoid at all costs. If?NHL general managers?want to steer clear of such?poor choices, they¡¯d do well to take a pass on the?following three players, all of whom have appeared in trade rumors.

Mike Green, D, Detroit Red Wings

At 32, Green is no longer the offensive force he once was, and his ability to tilt the ice isn¡¯t as notable as it used to be. This season, at even strength, the Red Wings blue-liner is producing his lowest rate of goals since 2013-14 (0.3 per 60 minutes) and a career low in primary assists (0.1 per 60). The share of scoring chances Detroit sees with Green on the ice (46 percent) is also a career low for him, eclipsing his previous low set last season (48 percent).

Green does have some value on the power play, but his 2.2 primary points (goals and first assists) per 60 minutes rank him 41st out of 60 defensemen playing at least 100 minutes with the man advantage.

Patrick Maroon, LW, Edmonton Oilers

The 29-year-old forward, set to become a free agent at season¡¯s end, posted a career-high 42 points last season and is on pace to post a similar total. However, who knows how well?the?6-foot-3, 227-pounder will do when skating without?Connor McDavid, arguably the best player in the NHL?

When?Maroon?is not sharing the ice with McDavid during five-on-five play, the Oilers produce fewer shot attempts (72 vs. 64) and scoring chances (38 vs. 30) per 60 minutes than they do when the two are together, illustrating that any team looking to add Maroon will likely need to put him with a very talented top-six center to get the most out of their new asset. And, according to?TSN¡¯s Pierre LeBrun, landing Maroon will cost?either a first-round pick or a top prospect ready to crack the NHL.

2017-18 Oilers (per 60 minutes at five-on-five) Shot attempts for Shot attempts against Shot attempt % Scoring chances for Scoring chances against Scoring chance %
Patrick Maroon
with Connor McDavid
72.0 57.6 55.6% 37.7 32.5 53.7%
Patrick Maroon
without Connor McDavid
63.8 64.0 49.9% 30.4 34.0 47.2%

Jack Johnson, D, Columbus Blue Jackets

Johnson skates 19 minutes 34 seconds per game and is regarded as a two-way defenseman. Unfortunately, the numbers don¡¯t back that up.

After adjusting for score effects (teams with a lead tend to play with a more defensive posture than those trailing) and special teams, the Blue Jackets take 48 percent of the shot attempts, earn 47 percent of the scoring chances and have 46 percent of the high-danger scoring chances with?Johnson on the ice. That ranks 59th, 56th and 60th among the 73 defensemen who are skating at least as much as Johnson this season. He does start 37 percent of the time in the defensive zone (fifth-most), but the quality of competition he faces, according to Corsica¡¯s shot quality metrics, puts him 59th among blue-liners with similar minutes played.

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