Quote from Bearscape »Stony is very medium versus humans. I could see bringing in a single copy of Stony if you have other cards to cut (mostly counterspells). I kind of do like (singleton) Stony versus the Vial decks that also bring in Relic, like Merfolk and DnT however.
In other news, as for now I am actually off JtMS, not because I think he is too slow per se, but because I am back on Nahiri. I just always liked that version of the deck most, and it has been performing very well for me
I'm also playing the good old Nahiri (+ Emmy) style UWr in the last couple of weeks and I must say it feels better than JTMS. In my experience Jace really shines in midrange strategies like Bant or other decks that can consistently cast it on turn3 and can back it up with board presence.