This deck can be expensive to put together so here are some cheaper alternatives for consideration.
Dragons
Most of the dragons ain't expensive and many of them are included in the Commander 2017 deck - Draconic Domination.
Scourge of the Throne - If you play more 1 v 1, you may not need an additional combat phase to finish off your opponent, so this can be substituted by other dragons like Bogardan Hellkite, Hellkite Overlord, Darigaaz Reincarnated.
Lands
Fetchlands
Fetchlands are expensive and getting your hands on the entire set of 10, can be prohibitively expensive for many players. Here are some cheaper alternatives:
a) Fetchlands which "Comes into play tapped" from Mirage - Bad River, Flood Plain, Grasslands, Mountain Valley, Rocky Tar Pit
b) Panorama lands - Bant Panorama, Esper Panorama, Grixis Panorama, Jund Panorama, Naya Panorama
c) Fetch for basic lands - Terramorphic Expanse, Evolving Wilds, Myriad Landscape
Dual Lands
I highly recommend playing Dual Lands with basic land sub-type so that they are fetch-able using Farseek and the likes. The earlier mentioned Battle Lands (Sunken Hollow) and Bicycle Lands (Fetid Pools) are good substitutes.
Ancient Tomb
Unfortunately, there aren't any budget alternatives for this card. It is down to personal preference which land you'd include to fill this slot.
Tutors
Tutors are extremely important for combo deck like this and we need a minimum threshold to ensure we consistently draw into them early. Demonic Tutor , Vampiric Tutor and Personal Tutor have a higher price tag and they can be replaced with:
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Mastermind's Acquisition - The new tutor from Rixals of Ixalan has a modest price tag but gets the job done nonetheless
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Grozoth - This card tutors for Dragonstorm at the cost of . An interesting point to note is that Transmute is an activated ability which can't be countered (except by cards like Stifle, Disallow, Nimble Obstructionist)
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Increasing Ambition - is on the high side but is worth considering if you don't have access to the other tutors
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Gamble - Only if you're feeling lucky!
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Long-Term Plans - Slows the tempo of the deck quite a bit and allows opponents to plan several turns in advance. Worth considering if you need to up the number of tutors in the deck
Ramp and Color Fix
Artifact Ramp
The 0 CMC artifacts (Mox Diamond and gang) are difficult to replace. You can consider some of these alternative artifact ramps:
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Mox Amber - The newest kid on the block but is only useful when Jodah is online
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Signets - Any of the signets can be considered depending on the final color distribution of your deck. Izzet Signet is highly recommended as many of the draw spells are blue and we've a fair bit of red ritual spells and our key card Dragonstorm is also red.
Color Fixing
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Prismatic Omen - Replace with Joiner Adept
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Manamorphose - Replace with Wild Cantor
Counterspells
There are a myriad of Counterspells to choose from so it really boils down to personal preference.
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Force of Will - Possible substitutes include Daze, Disrupting Shoal, Foil or Thwart
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Flusterstorm - Hindering Touch is the only other counterspell that has the storm mechanic, however, it's casting cost of makes it unattractive as a replacement here. I'd simply add another low CMC counterspell instead (e.g. Dispel, or the good old Counterspell).
Others
Yawgmoth's Will -
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Replace with Past in Flames. Yawgmoth cost less to cast and is more versatile while Past in Flames grants you access to instants and Sorceries only.
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Mizzix's Mastery greatly boost your storm count if your graveyard is loaded with goodies. However, you need to be able to generate for Dragonstorm after overloading Mizzix's Mastery, which can be challenging unless you've alot of rituals in the graveyard. I'd consider this a fun and win-more card.