His other innovation is the inclusion of Thing in the Ice. Thing in the Ice has been talked about a bit as a weapon for Grixis Control, but it might even make more sense in Blue Moon. Previously the U/R deck was forced to contend with whatever board position its opponent was able to deploy pre-Moon, but Thing in the Ice cleanly picks up any efforts one may have made to get on the battlefield, and then they’re stuck there due to the mana constriction!
Further, it also puts a blisteringly fast clock on an opponent, which may even be fast enough to fight previously difficult matchups like Burn.
The sideboard is nothing crazy. Despite the large number of singletons we’re mostly still operating on a variety of analogous effects to leverage with Snapcaster Mage. I do like the inclusion of Hibernation, though. We’re sometimes just going to need time to close out the game with Thing in the Ice, and this card can be high-impact when the number of turns in a game is smaller. Perhaps the same logic could be used to include Hurkyl’s Recall.
As of this writing, I certainly wouldn’t suggest another Blue Moon list over this one.