Parts of this may become out of date as the list evolves if I don't update the commentary at the same time.
There are several cards you might consider including in the deck that I have not. Here is my reasoning for the current choices but also why you might shift the deck based on your local meta or what's expected at the next tournament.
Now there is!
An earlier version eschewed Push for 2 Terminate main and third Thoughtseize. After some careful consideration of matchups (using Zvi Mowshowitz's "Elephanting" method against 11 of the most common archetypes) I realized that overall Push should benefit me more than hedging against a few specific cases of relatively rarer decks. As a nonblue Control/Midrange deck you're going to have trouble against the trifecta of Tron, Valakut decks, and Ad Nauseam while you've got reasonable chances against Grixis Control and Bant Eldrazi (the latter two's major threats don't die to Bolt or Push). Finding the right balance between these two types of tough to slightly unfavorable matchups without hurting your good pairings of aggro and most other midrange decks is a balancing act.
I'm currently inclined toward Push being the right trade of with a playset of Thoughtseize between main and board.
The deck runs a wide range of answers to early and late creatures between Bolt, Path, Terminate, and so on. From the board you have hate against mostly artifacts and lands. This means your biggest blind spot is planeswalkers, be they Nahiri, LotV, Ugin, or other. IoK misses most of these threats while TS hits them as well as late game creature bombs or combo spells like Scapeshift and Ad Nauseam.
- How do you deal with Blood Moon and land destruction?
The deck has 2 basics for each color except the Blue splash. With 10 fetchlands, this should suffice for dodging Blood Moon decks. You also have 2 Celestial Purge out of the board. You're going to be locked out of Snapcaster if you face a Blood Moon or targeted land destruction to Hallowed Fountain/Watery Grave but unless you draw multiples of Snap this isn't that devastating. That said, it's impossible to build a Modern deck that is strong against every angle of attack and one of the weaknesses of this deck is a grindy build paired with Blood Moon or land destruction to deny us some of our ability to recur answers.
More card commentary to be added in the future.