Answer by taking a quote from the following article:

Earvin "Magic" Johnson Jr. (born August 14, 1959) is an American retired professional basketball player and current president of basketball operations of the Los Angeles Lakers of the National Basketball Association (NBA). He played point guard for the Lakers for 13 seasons. After winning championships in high school and college, Johnson was selected first overall in the 1979 NBA draft by the Lakers. He won a championship and an NBA Finals Most Valuable Player Award in his rookie season, and won four more championships with the Lakers during the 1980s.

Johnson and Larry Bird were first linked as rivals after Johnson's Michigan State squad defeated Bird's Indiana State team in the 1979 NCAA finals. The rivalry continued in the NBA, and reached its climax when Boston and Los Angeles met in three out of four NBA Finals from 1984 to 1987. Johnson asserted that for him, the 82-game regular season was composed of 80 normal games, and two Lakers-Celtics games. Similarly, Bird admitted that Johnson's daily box score was the first thing he checked in the morning.  Several journalists hypothesized that the Johnson-Bird rivalry was so appealing because it represented many other contrasts, such as the clash between the Lakers and Celtics, between Hollywood flashiness ("Showtime") and Boston/Indiana blue collar grit ("Celtic Pride"), and between blacks and whites. The rivalry was also significant because it drew national attention to the faltering NBA. Prior to Johnson and Bird's arrival, the NBA had gone through a decade of declining interest and low TV ratings. With the two future Hall of Famers, the league won a whole generation of new fans, drawing both traditionalist adherents of Bird's dirt court Indiana game and those appreciative of Johnson's public park flair. According to sports journalist Larry Schwartz of ESPN, Johnson and Bird saved the NBA from bankruptcy.  Despite their on-court rivalry, Johnson and Bird became close friends during the filming of a 1984 Converse shoe advertisement that depicted them as enemies. Johnson appeared at Bird's retirement ceremony in 1992, and described Bird as a "friend forever"; during Johnson's Hall of Fame ceremony, Bird formally inducted his old rival.  In 2009, Johnson and Bird collaborated with journalist Jackie MacMullan on a non-fiction book titled When the Game Was Ours. The book detailed their on-court rivalry and friendship with one another.

What were some highlights of their rivalry?
The rivalry continued in the NBA, and reached its climax when Boston and Los Angeles met in three out of four NBA Finals from 1984 to 1987.