I'm predicting a Mentor variant to come around that features Moat. Hear me out: Moat is an absurdly good card all around. Mentor already runs Wear//Tear in the sideboard. I think Joe Brennan's Mentor list is heading in the right direction in terms of Planeswalkers. Additionally, Paradoxical Outcome is an absurd card all around. I'd like to see a Mentor Walker list come out that slams Moat early, plays Walkers and good cards to get tokens, then Paradoxical Outcomes the Moat away to open the gates of hell.
tl;dr Moat is a good card.