Like Beanith mentioned, I wish it wasn't a pain to use snow lands outside of proxying, but if you want to make a snow deck I think this is a lot better than Jorn, God of Winter if you aren't planning on stax-ing it up
However, if you're looking to up the power level of this deck, the black tutors are a good place to start
Throw in a few dozen tokens and you've got enough mana to pump out a hydra of truly terrifying proportions
And it scales with the amount of players at a table, a hallmark of great Commander cards
I can also do everything Im trying to do without splashing green, using Devious Cover-Up, which I absolutely love, but its a little clunky and doesnt let me go huge with The Mending of Dominaria, though that might not be necessary
What a champ