I don't think Dak is using magic. I think he is just good. I think he is better than Romo in the short to intermediate passing game. They can roll Dak out on bootleg and play action passes that are more effective with a mobile quarterback. They can use Dak on the zone read (plays that have been good for multiple touchdowns this year). This makes then extremely difficult to defend in the red zone.
Romo should be more accurate throwing 20+ yards down field, but that isn't a necessary part of the offense. Cowboys have been at the top of offensive DVOA all year without utilizing the deep passing game much. They are efficient by owning the line of scrimmage and owning the short to intermediate passing range. I think Dak runs it better than Romo would due to his mobility.
Romo should be more accurate throwing 20+ yards down field, but that isn't a necessary part of the offense. Cowboys have been at the top of offensive DVOA all year without utilizing the deep passing game much. They are efficient by owning the line of scrimmage and owning the short to intermediate passing range. I think Dak runs it better than Romo would due to his mobility.