Costner inked with NC State last November after spurning offers from elite programs like Kansas and UCONN among others.
"My decision (to pick NC State) wasn't tough," he said. "I felt very comfortable with the players especially after my visit. I am also very comfortable with the coaches there. It's also the ACC, and it happened to be the closest school to home that I was really considering. I have family only a couple of hours away in Maryland. My family and I are very happy about the decision."
When asked what was the most important factor in his decision, the answer seemed like a simple one for Costner: the NC State coaching staff.
"[They were] very important," he said. "I clicked with them better than any of the coaching staffs that were recruiting me. I really like them."
Costner has had a chance to watch the Wolfpack in action a lot this year, and he believes they have performed well given the circumstances.
"I think they've been playing hard, and that's the important thing," he said. "They haven't been at full strength since real early in the year and it's hard to get any consistency going if a new guy is hurt every week. I'm hoping they can get healthy and bounce back."
With NC State losing Julius Hodge, Jordan Collins, and Levi Watkins to graduation, there's a chance that Costner will have the opportunity to contribute early as a freshman.
Labeled the No. 26 rising senior in country according to Scout.com, he is considered the most heralded Wolfpack signee since Hodge inked four years ago. A consensus top 30 national prospect, the 6'8 combo forward has talked some with the Wolfpack coaches about what his role could be next season.
"I hope to see myself coming in and have an impact at whatever spot they put me," he said. "We've talked about playing the forward spots, but I just want to help them win."
Recently Costner was selected to play in this year's Roundball Classic, the national all-star game played March 22 at Chicago's United Center. He also hopes to play in one more all-star game before it's all over with.
"It feels great and it's a great honor, Costner said. "I'm just happy for the opportunity to play in a game like the [Roundball] Classic.
"I'm hoping to get selected for the McDonald's game too. We'll find that out I think at the end of the month. I like my chances."
As for now, Costner's trying to do whatever it takes to win a state championship and just get better as a basketball player.
"That's my goal... I want to win the championship."