The Dallas Mavericks traded up to select Luka Doncic in the 2018 NBA Draft. They wanted to get their guy. It cost the Mavs two first round picks, but they happily paid the price. They have not regretted the decision since.
Doncic went on to win Rookie of Year. He displayed his superstar talent last season when the Mavericks traded away Dennis Smith Jr. and put the ball in his hands. Over the final 23 games, Luka averaged 22.9 points, 9.7 rebounds, and 7.1 assists per game.
He came back for his second season and was immediately better.