In Thursday's final, at 7:30 p.m. at Radnor, Garnet Valley (17-5) will face No. 10 seed Avon Grove (18-3). The Red Devils rallied in the fourth period for a 6-5 win over No. 3 Conestoga (12-9) in Tuesday's semifinal opener.
Against Radnor, the Jaguars trailed by 4-1 at intermission.
"We needed to relax," Taulane said. "As long as we play as a team, nobody can beat us."
The 5-foot-10, 160-pound Taulane, a senior who will continue his lacrosse career at Division I Bellarmine in Louisville, scored two goals, as did teammates Brandon Dowd and Robert Raucci.
Of Taulane, a cornerback in football last season, Garnet Valley coach Frank Urso said, "He's playing phenomenally right now. He's kind of unstoppable."
In the third period, Raucci and Taulane scored to trim the deficit to 4-3. Raucci's second goal of the night evened the contest.
With a little less than two minutes remaining in regulation, Connor Burns gave Radnor a 6-4 advantage. Dowd made it a one-goal game with 1 minute, 18 seconds to play.
"We're a second-half kind of team," Taulane said. "It's awesome how we play when the game is on the line. That's when we really turn it up."
With goals from Alex Manderack and Mike Cherry, the Red Raiders (17-4) were ahead, 2-0, after the opening 12 minutes.
Garnet Valley 0 1 3 2 1 – 7
Radnor 2 2 1 1 0 – 6
Goals: GV-Robert Raucci 2, Brandon Dowd 2, Matt Taulane 2, Jon Vandenberg; R-Connor Burns 2, Alex Manderack, Mike Cherry, Ben Savitch, Tom Hemcher.
Saves: GV-Mitch Rose 7; R-Brendan Manderack 11.
Contact Rick O'Brien at firstname.lastname@example.org. Follow @ozoneinq on Twitter. Read his blog, "The O'Zone," at www.inquirer.com/ozone