Five-Color Niv-Mizzet
A Pioneer deck, by Matthew Minniear
1st place at a tournament in Mason, Ohio, United States on 2020-02-01
As reported at http://www.starcitygames.com

Maindeck:

Creatures
1 Paradise Druid
3 Siege Rhino
4 Sylvan Caryatid

Instants
2 Abrupt Decay
1 Kolaghan's Command
1 Utter End

Legendary Creatures
3 Niv-Mizzet Reborn
1 Tolsimir, Friend to Wolves
2 Uro, Titan of Nature's Wrath (Banned in Pioneer)

Legendary Enchantments
1 Oath of Kaya

Legendary Enchantment Creatures
1 Keranos, God of Storms
2 Klothys, God of Destiny

Legendary Planeswalkers
3 Teferi, Time Raveler (Banned in Pioneer)

Sorceries
4 Bring to Light
1 Deafening Clarion
1 Dreadbore
1 Enter the God-Eternals
1 Supreme Verdict
1 Unmoored Ego

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

Lands
1 Blood Crypt
1 Blooming Marsh
1 Botanical Sanctum
2 Breeding Pool
3 Fabled Passage
2 Godless Shrine
1 Hinterland Harbor
2 Mana Confluence
1 Overgrown Tomb
1 Sacred Foundry
1 Steam Vents
1 Stomping Ground
2 Temple Garden
1 Watery Grave
1 Woodland Cemetery

Sideboard:
1 Blood Baron of Vizkopa
1 Knight of Autumn
2 Rest in Peace
3 Infernal Reckoning
3 Mystical Dispute
1 Kunoros, Hound of Athreos
1 Slaughter Games
1 Supreme Verdict
2 Unmoored Ego