Dies to Removal

Narset is a PW that's absurd when neutral or ahead assuming you don't brick for the rest of the game. It's less match-up dependent than Ashiok was and even though I think some of the gushing is overlooking that this card isn't a slam dunk 4-of, it's only a tad bit worse than Jace, AOT and miles ahead of Jace, Memory Adept (which saw play).

Yeah congrats guys, you figured out that a 4 CMC PW isn't going to save you if you're way behind on board. This isn't good against Rabblemaster on the draw, perhaps the decks using Narset should have a fair number of cheap removal spells then. Even JTMS doesn't save you if when you end up miles behind on board. The fact that you can jam it into an on-board Siege Rhino or something and your PW isn't guaranteed dead is a bigger deal than you guys give it credit for.

edit: As far as decks go, it's probably a 2-3 in anything UWx that wants to be controlling. It'll probably help make Esper a real thing and straight UW gets a way to actually get ahead in the long-game. In Jeskai it may end up worse than Outpost Siege or Jeskai Ascendancy, but the Rebound thing is hardly MCL in that deck and she's got enough loyalty to be worth trying.