Tight end Saubert executed the game-winning two-point conversion for Seattle.
Seattle staged a remarkable comeback to defeat the Rams in extra time, clinching their spot in the postseason.
Rallying from a 30-14 deficit in the final period, the Seattle squad emerged victorious 38-37 at home, registering their fifth consecutive victory.
While the Rams had become the first to earn a post-season spot earlier on game day, the Seattle team booked their return to the postseason after a two-year hiatus.
With this outcome, the Seattle have taken over their Conference race with a twelve and three mark, supplanting the Los Angeles, who fell to the fifth seed with an eleven and four record.
Signal-caller Darnold threw two picks but recovered to deliver two touchdown passes, culminating in the second TD to wideout Jaxon Smith-Njigba in the extra period.
The visitors held a six-point lead at the break before Kenneth Walker III broke free for a 55-yard touchdown run for the home side.
Rams cornerback Josh Wallace then took back Darnold's initial pick for 56 yards, setting up a one-yard touchdown by Corum on the ensuing snap.
In the final stanza, a scoring pass from Stafford to Nacua pushed the Rams' lead to 30-14, but Shaheed ignited Seattle's comeback with a spectacular punt return.
Darnold then connected with Barner in the end zone, and a successful conversion sent the contest into an extra period.
Although Nacua scored for his another TD in overtime, Jaxon Smith-Njigba responded in kind to setup the decisive conversion.
A seasoned esports journalist and gaming enthusiast with over a decade of experience covering competitive gaming scenes across Europe.