American Mason Cox unleashed an early onslaught and Brody Mihocek provided the late heroics to power Collingwood to a famous one-point win over West Coast in Saturday night's elimination final at Optus Stadium.
Cox reprised memories of his demolition job on Richmond in the 2018 preliminary final by booting three goals in as many minutes in the opening term.
West Coast snatched back the lead in a see-sawing final quarter, but Mihocek kicked two late goals and took an important defensive mark to lift his side to a 12.4 (76) to 11.9 (75) win.
The victory sets up a semi-final showdown against Geelong at the Gabba next Saturday night.
"He's showing us his best football now," Collingwood coach Nathan Buckley said of Cox.
"He's really hard to defend when he keeps going to the ball at the highest point.
"When he's aggressive in his body work he's really hard to stop. Defenders nearly need to sacrifice a play at the ball to be able to go at him."
West Coast coach Adam Simpson said Cox's early heroics were a big blow to his team's victory hopes.
"They were three good marks. It's a little bit unusual for our boys to concede that," Simpson said.
"Unfortunately in finals especially when they go for 100 minutes, conceding three goals in a row puts you on the back foot. It didn't cost us the game, but it helped set up the game."
Eagles ruckman Nic Naitanui (17 disposals, 24 hitouts, seven clearances) won his contest against fellow All-Australian Brodie Grundy (12 possessions, 19 hitouts, two clearances), but the Magpies still created enough opportunities.
Adam Treloar, Taylor Adams and Scott Pendlebury produced big games through the midfield, while Mihocek and Cox ended up with three goals apiece.
Eagles spearheads Jack Darling and Josh Kennedy also booted three goals each, while Liam Ryan was at his creative best.
West Coast's midfield couldn't get going in the opening term with Dom Sheed, Tim Kelly and Luke Shuey combining for just two disposals between them.
Collingwood won the inside 50m count 14-8 and Cox cashed in with the most productive three minutes of his career.
Cox took three contested marks against Tom Barrass during that period and converted each time to silence the 32,865 crowd.
After booting his second, Cox stuck out his tongue and showed two fingers in a swagger-filled goal celebration.
And when Oscar Allen stuck out his hand and slapped Taylor Adams in the face to gift the Magpies midfielder a 50m penalty and a goal, the Eagles were down 24-7.
Kennedy booted two goals for the second quarter and Darling one to reduce the margin to three points at half-time.
West Coast twice hit the lead during the third quarter, but goals to Will Hoskin-Elliott and Mihocek gave the Magpies a 10-point buffer at the final change.
The Eagles again hit the lead early in the last, but a stunning goal from Mihocek on the boundary line and another goal after a strong mark gave Collingwood a 13-point edge.
Late goals from Kennedy and Darling closed the gap to one point with 77 seconds left, but Collingwood were able to hold firm in the dying moments.