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Niv-Mizzet Reborn
A Pioneer deck, by Kevin Hoang
1st place at a tournament in Lexington, Kentucky, United States on 2020-03-14
As reported at http://www.starcitygames.com

Maindeck:

Creatures
1 Arboreal Grazer
1 Gilded Goose
4 Sylvan Caryatid

Instants
2 Abrupt Decay
1 Utter End

Legendary Creatures
4 Niv-Mizzet Reborn
2 Uro, Titan of Nature's Wrath (Banned in Pioneer)

Legendary Planeswalkers
1 Nahiri, the Harbinger
4 Teferi, Time Raveler (Banned in Pioneer)
1 Vraska, Golgari Queen

Sorceries
4 Bring to Light
1 Enter the God-Eternals
1 Hour of Devastation
2 Slaughter Games
1 Thought Erasure
2 Thoughtseize

Basic Lands
1 Forest
1 Island
1 Mountain
1 Plains
1 Swamp

Lands
2 Blooming Marsh
1 Botanical Sanctum
1 Breeding Pool
1 Concealed Courtyard
4 Fabled Passage
1 Frontier Bivouac
1 Godless Shrine
1 Hallowed Fountain
2 Mana Confluence
1 Overgrown Tomb
1 Sacred Foundry
1 Sandsteppe Citadel
1 Steam Vents
1 Temple Garden
2 Temple of Abandon
1 Temple of Mystery
1 Watery Grave

Sideboard:
1 Shifting Ceratops
1 Voice of Resurgence
2 Fatal Push
1 Mystical Dispute
1 Silumgar's Command
1 Questing Beast
1 Tamiyo, Collector of Tales
1 Vraska, Golgari Queen
1 Casualties of War
1 Deafening Clarion
1 Hour of Devastation
1 Rakdos's Return
1 Solar Blaze
1 Thought Erasure