It’s really going to depend on what’s in M15 and the next block, but I agree that a shell like the current devotion deck is unlikely to exist. That said, Master of Waves is unlikely to be completely unplayed for as long as it’s Standard legal.

I don’t think mono-U devotion will be a deck come rotation. You lose Mutavault, Specter, Weird, Tidebinder Mage, Jace, Cloudfin Raptor, Judge’s Familiar, Galerider Sliver (I know some people that run a few of these for the Mutavault interaction)…

I like the card, but I don’t see the Bestow happening much at all. I’d probably play one or two in Blue Devotion. I’m not sure if it will still be the kind of card blue decks want post rotation, but it’s worth remembering. I didn’t think it was much worth discussing as the upside on it doesn’t seem better than Galerider Sliver and that card is already not seeing much of any play in Blue Devotion.

I was considering it as a sideboard option against Green decks, but most commonly the drawback is very bad. When it dies you’re down two cards and against decks that are trying to race you the extra card can just matter more than the 5/5 body. That and I don’t believe that it’s close to as good as Herald of Torment or Mogis’s Marauder. To be fair, I could have discussed this in the article itself, but I don’t believe that it’s maindeckable, and I’m pretty sure you’re already good against the decks that I’d want to sideboard it against.