It's too big a tell, though. "Oh hmm weird my opponent has 2UB available, what on EARTH could they be up to. You know what, I've never fatesealed before, what's that like"
I don't get this. Surely it's just a positive side effect of Notion Thief that it preemptively shuts off your opponents Jace's brainstorming ability. I mean how often do you really have Notion Thief in hand?
It's not going to stick, is all. How many times do you need Brainstorm to blow up and 1-5 yourself before you just play around it? Which is most of what Notion Thief is going to see play over. Look at it, it's a silver bullet - just happens to do a series of things that makes Jace backfire and die. It gives you the BS cards, forces the Jace player to Plow Under their hand and then hits Jace for 3 to stuff it in the bin.
It'll have corner applications, I'm sure someone will try and snag a Recall or like a random Breakthrough off it or whatever. It isn't like it's hard to play around a 3/1 for 4 though. I'm betting someone somewhere has been waiting for this very moment to break out the Lava Darts. Eventually it'll just settle into something that catches someone off guard once in a while, but most of the time people will just answer Jace with their own Jace and things will settle down.
