Carrier, who was originally drafted in the 4th round of the 2015 NHL Entry Draft by the Nashville Predators, has played in 49 games for the Preds this season, amassing 4 goals and 11 assists, totaling 15 points over that span. The 5'11, 175-pound defenseman isn't the biggest player you'll find, but he does a lot of the right things, including blocking shots and not shying away from the physical aspects of the game.
The 27-year-old Quebec City native is a +31 in his 193-game NHL career while playing for a consistently re-tooling franchise over the last 6 seasons. Is he a star? No, but he could be a valuable role player in Toronto on that 3rd pair. Obviously, Carrier would not be the Leafs' only blueline target. They would still need someone to play a little higher up, within the top-4, to replace the injured John Klingberg if they're hoping for a longer playoff run this season.
The beauty of chasing a guy like Carrier is that he won't cost a lot and would undoubtedly leave the Leafs with all of their top trade chips with which to barter for a top-4 improvement - someone like Calgary's Chris Tanev or Noah Hanifin, for example.