Expedite and Wall of Shards look out of place, and Growth Spiral doesn't look that strong given how little lands you are running. Lightning Bolt could be some additional removal.

zapyourtumor, thank you for your comment.

Expedite felt needed (from FNM experience with an older Snow pile) to make Abominable Treefolk and Marit Lage token attack asap, since they're the win conditions. After KHM it's also nice to hit Jorn, God of Winter  ^Flip with it.

Growth Spiral is just a bit of draw and ramp here (dropping snow basics is the safest way to stack snow permanents), it also feels nice coupled with Ice-Fang Coatl for feints, keeping things flexible. And yeah, I would have boarded 4 if the list needed more Lands.

As for Wall of Shards, yeah it looks janky, I just wanted to give it a try, with Glacial Revelation and stuff like that, any cheap snow permanent with out-of-the ordinary kit feels worth trying. In Modern and its short matches the upkeep effect might not be relevant, since we're trying to hit face with big creatures.

I was actually giving some thought to Lightning Bolt as a Modern staple too good not to use, it's just that the list is so cramped already, and I want to keep it flavorful.