The Brandon Wheat Kings are a win away from claiming the WHL Eastern Conference title for the second straight year.
The Wheaties got a 4-2 win in Red Deer to take a 3-1 series lead back to Brandon.
Brandon took a 2-1 lead into the third but the Rebels tied it just 17 seconds in on the power play.
Tim McGauley gave Brandon the lead again with a goal 6:36 into the third, setting up a white-knuckle finish. Tanner Kaspick sealed the win with an empty-netter with just 55 seconds left.
Jordan Papirny made 34 saves for the win.
Brandon can advance to the WHL final with a win on home ice Friday. The puck drops at 7:30.