Holmstrom, 23, made his NHL debut, and Laviolette used him on the penalty kill. He began the night on a line with Blair Betts and Jody Shelley.
Betts returned after missing four games because of a lacerated left ring finger. Defenseman Chris Pronger, sidelined for one game because of a hand injury, also returned to the lineup.
Holmstrom, a 6-foot-1, 202-pounder, had 10 goals and 17 assists with the Phantoms.
The Flyers were able to recall him because there is no roster limit after the trade deadline. Before then, there was a 23-player limit. They did not, however, have enough salary-cap space to call up another player unless they used one of their two remaining emergency call-ups.
Holmstrom nearly made the team in training camp, which boosted his confidence.
"It was huge to get off on the right foot," Holmstrom said before facing the Leafs. "To get a chance to get comfortable around some of the guys, so it's not the first time you see faces and stuff. Hopefully, it makes tonight a little easier."
Laviolette was eager to see how much Holmstrom has progressed.
"He impressed a lot of people at training camp with his work ethic," the coach said. "I think, first and foremost, he's a real solid defensive player who works extremely hard on the ice. He served certain roles down in Adirondack, killing penalties and [taking] faceoffs, and we'll probably utilize him in that role tonight."
Holmstrom played 8 minutes, 6 seconds and recorded a game-high five hits. He was 3 for 10 on faceoffs.
Contact staff writer Sam Carchidi at 215-854-5181 or firstname.lastname@example.org.