The Leafs have an abundance of jerseys between the standard home/away blue and white, the Reverse Retro (now retired for the season), the Toronto Arenas, the Toronto St. Pats green and whites and the controversial Drew House/Maple Leafs black and blue reversible collab jersey, which was named the team's official 3rd jersey last season.
While we don't currently have a full schedule of which unis the Leafs will wear on which dates, we do know that they'll wear the Justin Bieber collab jerseys at least 3 more times this season, thanks to a teaser video from the Leafs. Per the video, the Leafs will wear the black and blues on December 22nd, January 27th and March 29th.
The reviews on the Drew House collab have been mixed, with the next generation of fans loving the cutting edge look and reversible feature, but it hasn't sat overly well with the hockey purists who are sticklers for tradition.