There's a reason why so much juice is attached to this 5 total. There haven't fewer than five goals scored during any of the five previous games played in this Stanley Cup championship series. 
I'm going to ride that trend here with the high-scoring Lightning, who led the NHL in scoring during the regular season and are averaging 3.7 goals in their last four games. Dallas has shown it can be aggressive with attacking defensemen to go with high-scoring veteran centers and forwards. The Stars have scored 3 or more goals in four of their last six games. 
This has been an Over series for a long time with the high end cashing 77 percent of the time during the past 26 meetings.
Tampa Bay leads the series 3-2 and is heavily favored in this game. So if the Stars are trailing with time running out they are likely to pull their goalie and keep him out even if falling behind by two goals since they have nothing to lose.