For me:
1. Gurley is healthy and goes off in both the run and pass game. And/or CJ Anderson is no joke, and pounds the defense into submission.
2. The Minnesota/KC game Goff shows up and slices the Cowboy secondary to ribbons.
3. Aaron Donald breaks through and strip sacks Prescott, maybe more than once, and otherwise creates havoc in the backfield.
4. Talib/Peters are healthy and ready to go. Prescott puts up some careless throws under pressure from Donald and they pick him.
5. The Rams are sick and tired of hearing about the Cowboys being the physical team, and arrive with some steam coming out of their nostrils.
Ramily!