what kind of strategy did he use in the nhl?
A more team-based strategy.
Wayne Gretzky
Gretzky had a major influence on the style of play of the Edmonton Oilers and in the NHL as a whole, helping to inspire a more team-based strategy. 
what nhl teams did wayne gretzky play for Edmonton Oilers, Los Angeles Kings, St. Louis Blues and New York Rangers. who is wayne gretzky? A Canadian former professional ice hockey player and former head coach. what is the full form of nhl? National Hockey League. when was he born? 26 January 1961. has he retied from hockey? Yes. did he play any other sport? No. when did he retire? 1999. what else is he into after retiring? As part-owner with Andrew Peller Ltd., he opened a winery and distillery . which hockey cup did he win? He won  nine Hart Trophies as the most valuable player, 10 Art Ross Trophies for most points in a season, two Conn Smythe Trophies as playoff MVP and five Lester B. Pearson Awards. what's his style? He was considered to be very smart and creative in his play. who are his influences? His father. does he have a sobriquet? Yes, "The Great One". is he married? Yes, to Janet Jones. does he have kids? Yes, five. They are Paulina, Ty, Trevor, Tristan, and Emma. has he written books? Yes, several including Gretzky: An Autobiography" , "99: My Life in Pictures" , "99: Stories of the Game" . is he part of any political party? Yes, during the 2015 Canadian federal election campaign, endorsed the Conservative Party . did he participate in any of the olympics? He was Executive Director of the Canadian men's hockey team at the 2002 Winter Olympics in Salt Lake City, Utah.
wiki:19666359
Wayne Gretzky [SEP] Strategy and effect on NHL play
Gretzky had a major influence on the style of play of the Edmonton Oilers and in the NHL as a whole, helping to inspire a more team-based strategy. Using this approach, the Oilers, led by Gretzky, became the highest scoring team in NHL history. "He was, I think, the first Canadian forward to play a true team game", said hockey writer and former NHL goaltender Ken Dryden. The focus of the game prior to Gretzky's arrival, he said, especially among the Canadian teams, was on the player with the puck—in getting the puck to a star player who would make the big play.