VANCOUVER — He’s reputed to be the greatest boy wizard since Harry Potter.

Well, Johnny Gaudreau hit hockey’s equivalent of Hogwarts on Sunday and showed some witchcraft that might’ve astounded even old Dumbledore.

With his parents Guy and Jane in the pews at Rogers Arena, Johnny Hockey cast a pretty persuasive first spell on the Calgary Flames, scoring his first NHL goal at 15:22 of Period 2 on a deflection, with assists to Joe Colborne and Chris Breen.

In fact, young Gaudreau was about the only positive to be found on the evening. He seemed to be a guy giving a sharply-honed performance in an abominably bad play.

The Flames, so competitive so often during this season of renewal, were systematically shredded 5-1 by the desperately disappointing Vancouver Canucks.

“It was a fun game. I wish we’d come out with a win, but it was a great experience for me to get in my first game,” said Gaudreau afterward. “I thought it was a little bit faster than I expected. I thought I had a good practice (Saturday), but I was a little nervous today. I looked down the ice in warm-ups, looked down at the other end and there a lot bigger guys than I expected. That was a little shocking.

“I thought I had an all right game.

“I was just at the right place at the right time. A nice shot by Breener. I just happened to be standing at the right spot, so I had a nice little tap-in goal.”

Gaudreau was deployed on two lines, alongside Boston College buddy Bill Arnold — whose parents Kirk and David were on hand to see him take his NHL bow, too — and Paul Byron, as advertised Saturday by coach Bob Hartley, and then he was put with Matt Stajan and Jiri Hudler. On a few occasions, Gaudreau was as smooth as crooner Michael Buble, in town for the Pat Quinn Ring of Honour pre-game ceremonies.

Calgary boss Bob Hartley was happy with his newbies.

“I liked what they brought. Johnny got his first goal and Billy Arnold seemed very comfortable — I think playing centre in the last game of the season, your first NHL game after one 50-minute practice under your belt, I thought the two boys did a very good job.”

The seasonal curtain-dropper for both sides was marred by a frightening hit from Byron on Daniel Sedin in the corner to Canucks goaltender Jacob Markstrom’s right with 2:44 remaining in the second period. Sedin, whose head cracked against the glass on impact, stayed down for a worrisome few minutes as the building went quiet. An emergency medical crew finally got him stabilized on a stretcher and off the ice.

“I was just on the puck in the corner, just trying to finish my check. I saw the replay again. I didn’t think it was a dirty hit. That wasn’t my intention. I just hope he’s OK. The game’s so fast. We only have split seconds to make decisions. That wasn’t my intention at all.

“It’s really scary. You never want to see that.”