Coulter-Nile hadn't been on a cricket pitch since late November because of hamstring wounds, yet featured with bat and ball to give the Scorchers a 18-run triumph over the Melbourne Stars at the WACA Ground on Sunday.
The misfortune was the Stars' fourth in four years at the semi-last stage, and third at the last obstacle to the Scorchers.
The guarding BBL champs will now go against the Sydney Sixers in Canberra on Wednesday.
The win sent a cautioning to the Sixers: this Perth side dependably supposes its in the diversion, particularly with Coulter-Nile back in the side.
The Scorchers' 144 appeared a bit short on Sunday, yet the Stars batsmen attempted to discover any cadence from the start, winding up with 126 hard and fast.
Cameron White consumed up 24 balls for his 13 preceding edging to manager Sam Whiteman off the bowling of Yasir Arafat.
Be that as it may with Kevin Pietersen at the wrinkle, Melbourne still appeared an enormous possibility.