@stormanimagus I ran Noble Fish for most of 2011 - 2012 and played it at Eternal Weekend. I was suggesting to close some gaps that I see in your meta-game match ups.
I built a version of your deck and I did not go with Thalia, I went with Shardless Agent. I the prison aspect of Thalia is just not good enough against Shops now, being very honest about it. The issue with the deck is speed and pressure.
You do not have enough control against the aggro decks and you do not have enough aggro against the control decks.
I love playing White and I think there is a balance here but Stony Silence does not stop Shops or PO, I assure you that it may help a little but I played PO and I dealt with Stony Silence against LandStill every time, I had to.