You are my hero!
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If you have a suggestion on how to make this deck better then feel free to comment!
Looks pretty good but to go with what Hydregion said, you should add in some low cost burn and or removal spells into your sideboard in case you play against a low mana cost deck.
What about Marrow Bats?
Are the terramorphic expanses really necessary?
4 SPINED WORMS!!! lol jk how 'bout 4 flame slashes?
Try to trim it down to 60 cards. If you want help starting try eliminating Voice of the Provinces, for 5 mana it really doesn't do much.