The total for each of the first four games of this Western Conference Finals series has been lined at 5 1/2. Each game has gone Under. The oddsmaker has finally adjusted moving the total down to 5. 
So now is the time to play Over. 
The Golden Knights are in desperation territory down 3-1. Las Vegas finds itself on the brink of elimination despite outshooting the Stars, 105-67. Dallas backup goalie Anton Khudobin has played well above his head. 
The Stars realize they can't keep getting lucky winning low-scoring games while relying on Khudobin to bail them out. They have to step up their attack like did when they took out Colorado during their previous series. Dallas averaged four goals per game during that seven-game series. The Stars' power play has managed just one goal. So that is due to change, too.
I envision a much more up-tempo game than what we've seen so far in the series. The Golden Knights will be aggressively attacking with all four of their quality lines. This could result in a much higher scoring game for them. If it fails, the total still is very much live to go Over as the Golden Knights won't hesitate to pull their goalie early if down by one goal and keep their goalie on the bench, too, if the Stars score an empty-netter to go up by two goals. This is a scenario that happens when teams face elimination.