Why not use Snow Covered Islands in the main deck?? They have an obvious synergy with Storm Crow that would give you consistent turn 1 wins. Also, have you considered splashing a swamp for Black Cat? This list is insane bro
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I feel like you could cut some lands. 26 might be a bit high, especially if you're going to be playing Heartless Summoning to bring down your casting costs. Also, check out Myr Superion - he is a free cost 4/5 with Heartless Summoning out - a must have for this deck! :)
Cool idea! Considering how many creatures you're throwing in your yard, Skaab Ruinator might be a good addition. Also, maybe throwing a couple leaks in there, giving some more snapcaster synergy. I'd probably look to Sever, Perilous, Mentor and Doomed Trav for room. Just some thoughts, I like how Grimgrin is getting some love :)