Interesting to see the UWR Mentor decks edge towards a more "big blue" configuration, in one case ditching hush altogether. Food for thought!
I have played variations on this list for the last four months at these Xtreme Games tournaments with a good amount of success (Feb 1st place, Mar 3rd place, April 8th place, May 3rd place). When Monastery Mentor was first printed it looked like a great card to pair with Mystic Remora. Kevin Cron was the first to bring it to a tournament that I saw (which he won), but I believe his played Gush.
The list I was working on specifically didn't play Gush because it has no real synergy with Mystic Remora. One thing you do not want to be doing with Remora in play in returning lands to your hand, as paying for Remora's cumulative upkeep becomes tricky. I wouldn't really call this a "Mentor deck" because it runs very light on Monastery Mentors. It's largely a control deck that wins most often with a Tinker into Blightsteel Colossus finish. I would say 50% of wins are with BSC, 30% with Mentor, and 20% with JTMS/Snapcaster beats.
