Total for the ASG tonight is only 3.5 and I'm going big on the over.
Here's the history of MLS ASGs:
ALL MLS ASGs
If you check the early days, when it was just 2 all star squads divided by conference/nationality, the matches were almost always wide open and every single one hit 4+ goals, sometimes 10+ goals.
Then MLS went to the format where they played a big club team. This led to matches where at least 1 side was more organized, and led to lower scoring matches.
However, I feel like this match will be much more in the vein of the earlier matches, where the play is wide open and players are more worried about putting on a show and scoring than playing tight, organized soccer.