Fun fact #1 about the NHL: more than half of the teams in it make the playoffs. It's true. Do the math.
Fun fact #2 about the NHL: luck matters a lot.
No, really.
For those who are already familiar with the stat, PDO is generally considered to by the "luck" statistic in the NHL. It is calculated as the Sv% (save percentage) + Sh% (shooting percentage).
Now many take issue with calling an individual player's PDO luck. They have been proven wrong time and time again and almost all of the evidence that we have on the topic indicates that a player cannot drive their on-ice shooting percentage to be noticeably higher than the league average.