Lankinen made 20 saves in Finland's 3-1 win against Canada on May 10 in the first game of the tournament.
Since then, Canada has won eight straight, outscoring its opponents 43-11.
"We just need to focus on doing what we need to do and doing the things that make us a good team," Murray told Hockey Canada's website. "[Finland] is going to be a good test for us again. I was very impressed the last time we played against them. We know they're a good team, so it's going to be a good game."
Also Sunday, Russia and the Czech Republic will play for the bronze medal (9:30 a.m. ET; NHLN). Russia will try to win a medal for the fifth time in the past six tournaments. The Czech Republic's last medal was a bronze in 2012.
The game will feature two of the tournament's top three scorers. Russia forward Nikita Kucherov (Tampa Bay Lightning) has six goals and 10 assists, and Czech Republic forward Jakub Voracek (Philadelphia Flyers) has four goals and 12 assists. They are tied for second with 16 points, two behind Sweden forward William Nylander (Toronto Maple Leafs), who has 18 points (five goals, 13 assists).