Holy $#!+. It wasn't enough to make the now-ubiquitous "everything gets this set's mechanic" card, but they had to make everything UNCOUNTERABLE too? Seriously?
Snapcaster Mage is (ETA: WAS) already banned in at least one format; they had to make one that's THAT MUCH better?
What's that? People ONLY cast Counterspells with Snapcaster, and the effect is symmetrical so it's bad? As if. I'm just about done with the powercreep in Standard. Other formats and I MIGHT not care, but this will be IN STANDARD. WTF WOTC.
ETA: Apparently the Banlist page was bugged and Snapcaster isn't banned in Modern. That's about the third time I've had to triple reference something, but it was something different each time. Gatherer and Scryfall said otherwise, and when I went back it was fixed. I apologize for the confusion.