How many players who were drafted by the Toronto Maple Leafs have played over 300 games in their first 7 years of the NHL career?
drafted by the Toronto Maple Leafs refers to overallby = 'Toronto Maple Leafs'; played over 300 games in their first 7 years of the NHL career refers to sum_7yr_GP > 300;
SELECT COUNT(ELITEID) FROM PlayerInfo WHERE overallby = 'Toronto Maple Leafs' AND sum_7yr_GP > 300