A couple of reports for people like myself who have no idea who he is.
"McDonald is a tall, lanky goaltender with natural coverage coupled with a strong posture between the pipes. For his size, has quick athleticism and reflexes but remains a goaltender that more often blocks pucks instead of saving pucks - Elite Prospects"
"Athletic and exceptionally quick, Charlottetown Islanders goaltender Mason McDonald is one of Canada’s brightest prospects between the pipes. He possesses ideal NHL size and some of the best lateral quickness setting him up perfectly to make save after save. McDonald has a sound understanding of goaltending technique and mental toughness but he is prone to wandering out of position occasionally. Coming off an outstanding showing at the Under-18 World Championships, McDonald picked up the Best Goaltender award after backstopping Canada to a bronze medal posting a stellar 1.94 GAA and .930 save percentage. - Brendan Ross, Dobber Prospects"