MTG Salvation

I feel better knowing that I'm not overlooking something obvious.

I don't see any reason for this deck to use snow lands rather than regular basics. There's no skred. Arcum's Astrolabe has been banned... Can someone point out what I'm missing?

1 Agony Warp
3 Ash Barrens
4 Brainstorm
3 Counterspell
1 Deep Analysis
4 Delver of Secrets
2 Dimir Aqueduct
1 Dismal Backwater
2 Echoing Decay
3 Evolving Wilds
1 Exclude
2 First-Sphere Gargantua
3 Ghastly Demise
4 Gurmag Angler
2 Mental Note
1 Preordain
2 Rain of Revelation
9 Snow-Covered Island
2 Snow-Covered Swamp
3 Snuff Out
3 Sultai Scavenger
4 Thought Scour

1 Augur of Bolas
1 Blue Elemental Blast
1 Diabolic Edict
3 Dispel
1 Echoing Truth
1 Hydroblast
1 Nausea
2 Nihil Spellbomb
2 Stormbound Geist
2 Vampiric Link