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I love the maindeck, very solid, but I would consider to cut the 20th land to add another burn spell (like Flame Rift) or a copy of Risk Factor. The sideboard is nice but I would play one more...

Why are you splitting 2/2 instead of 0/4? Rift Bolt is better almost always

Maybe you could move the prices to the sideboard? I don't know your meta, but in some matchups they are really dead cards. So without price and light up you have 5 flex slots, in which you can try 3...

I think both Skewer and Light Up are really good additions to the deck, what do you think of something like this?

19x Mountain

4x Goblin Guide
4x Monastery Swiftspear
4x Eidolon of the Great...