Changes:
In: Thousand-Year Storm, out: ?
In: The Locust God, out: ?

Need:
Veyran, Voice of Duality - Commander alternative and big beater
Beacon Bolt?

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Consider:
* Expressive Iteration
Narset's Reversal
Sharknado
Omen of the Sea
Improbable Alliance
Storm's Wrath
** Dramatic Scepter + Banefire/Blue Sun's Zenith (or just Explosion) - 2-3 cards
Myriad Landscape - Get double red for Niv
* Leyline of Anticipation
* Goblin Electromancer
* Midnight Clock
* Wayfarer's Bauble
Shoes
* Curiosity - Finish the game when it's time
* Chemister's Insight
* Mizzix's Mastery
* Bonus Round
Counterflux
Magic Mirror
Ophidian Eye - Curiosity with flash
Blink of an Eye
Jace's Sanctum
Torbran
Epic Experiment
Finale of Revelation
Bond of Insight
Melek
Mystic Retrieval
Ignite Memories
Crackling Drake
Spelltwine
Rise from the Tides
Glimmer of Genius
Narset, Parter of Veils + Wheels (Echo of Eons, Whirlpool Warrior, Jace's Archivist)
Dragonshift
Sphinx's Tutelage
Thermo-Alchemist
$$ Arjun, the Shifting Flame
Library of Leng
Aetherize/Aetherspouts
Windreader Sphinx - Useful when Locust God is the commander

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Considered cuts:
Highland Lake - Replace with a better land?
Some counterspells? Cryptic?
Laboratory Maniac
Mission Briefing
Mizzium Mortars
Windfall, Reforge the Soul - Wheels are not as important when Niv is the only card needing the draws
Firemind's Research
Mind Stone - Colorless mana, but does draw a card

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Cuts:
Snapcaster Mage - Too important in modern/legacy
Bident of Thassa
Locust God - Needed in Bolas
Chandra, Flamecaller
Consecrated Sphinx
Fevered Visions
Dig Through Time - Doesn't draw cards, and is more needed elsewhere
Brainstorm - Likely to get brainstormlocked, and has a bunch of other cantrips anyway
Commit // Memory - Use in Yuriko instead
Disallow - Used in Pioneer MonoU
Spirebluff Canal - Used in Pioneer
Reverberate - Wort