Sportsnet’s top 20 impactful NHL trade candidates who could move by the deadlineAfter a flurry of action on Wednesday, the countdown has begun until Friday’s NHL trade deadline. Who’s still left? Check out Sportsnet’s top 20 trade candidates list. Maple Leafs acquiring defenceman Joel Edmundson from Capitals for draft picksThe Toronto Maple Leafs have acquired veteran defenceman Joel Edmundson…