This was a well-timed thread. Just a month ago, the Nottingham Sheriffs of the British league not only used 3 goalies, they also shared a shutout!
http://m.thisisnottingham.co.uk/story.html?aid=17208814
How it happened:
- First goalie knew he had to leave early for personal reasons. After 1 period he was replaced.
- Second goalie was injured with 5 minutes left, still carrying the shutout. This technically left the team with no official goaltenders.
- Knowing in advance that they'd need an emergency backup in case of this situation, the team carried an 18-year-old skater with the brilliant name of Sam Gospel, who changed into goalie gear and was ready to play the final 5 minutes.
Pretty sure that 3 goalies sharing a shutout is unique in pro hockey history.