DALLAS — Mikko Rantanen figures he would have left the room in disbelief had someone told him at the beginning of this season that he would score a hat track in a Game 7 against Colorado. After all, that was the organization with which he made his NHL debut just weeks before his 19th birthday. He was there for 9 1/2 years and went to the playoffs each of the past seven seasons with the Avalanche in a run that included their 2022 Stanley Cup title. But twice traded in a six-week span earlier this year, Rantanen did exactly that and more against his original team. Rantanen assisted on Wyatt Johnston’s tiebreaking power-play goal in between his first career postseason hat trick — all coming in the third period of Game 7 for the Dallas Stars on Saturday night. They overcame a two-goal deficit for a 4-2 win over the Avs to wrap up the first-round Western Conference series. “It’s emotional for sure because everything happened so quick,” Rantanen said. “It’s only a couple of months since I was still with them, playing with them, and chasing a playoff spot and stuff. And all of a sudden, a couple of months later, playing against them in a Game 7.”After a four-point second period in a loss at Colorado two nights earlier, Rantanen became only the second player in NHL history to have four …
