4 selfless spirit
4 reflector mage
3 stasis snare
4 port town
4 prairie stream
1 westvale abbey
1 jace, unraveler
2 blessed alliance
1 q field
2 void shatter
1 summary dismissal
that's the list I have sleeved up atm.
haven't been a fan of rattlechains at all and negate in the main has been very good.
I thought about going 4/1 snare/dec like you have but I've liked having the 2 dec... it's a big way you can beat ishkanah.
main decks are all pretty close though and the small difference isn't going to change a lot
I've really liked the bruna/gisela package as extra threats vs control and being really good in the mirror,
the biggest thing you'll notice I'm missing is the 2 rejection/2 fragmentize but most match ups I either don't want them (as they're awkward and only good vs the right draws) or it's marvel that I feel I have covered very well.
Void shatter is another big way you're able to beat ishkanah
Haven't been a fan of skywhallers shot and would likely play the extra dec in sb if I wasn't maining 2
jace/q field are the main cards I'm not dead set on but jace has been solid in the mirror, I find it board stalls a lot and having an extra planeswalker has been very good. Q field is just a mise 1 of basically