Five-Color Niv-Mizzet
A Pioneer deck, by James Moskal
2nd place at a tournament in Indianapolis, Indiana, United States on 2020-01-25
As reported at http://www.starcitygames.com

Maindeck:

Creatures
1 Hostage Taker
3 Paradise Druid
2 Siege Rhino
4 Sylvan Caryatid

Instants
2 Abrupt Decay
1 Utter End

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

Legendary Enchantments
1 Oath of Kaya

Legendary Planeswalkers
1 Nahiri, the Harbinger
3 Teferi, Time Raveler (Banned in Pioneer)

Sorceries
4 Bring to Light
1 Cut
1 Supreme Verdict

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

Lands
1 Blood Crypt
1 Blooming Marsh
4 Botanical Sanctum
2 Breeding Pool
1 Concealed Courtyard
4 Fabled Passage
1 Frontier Bivouac
2 Mana Confluence
1 Nomad Outpost
1 Stomping Ground
2 Temple Garden
1 Temple of Plenty
1 Watery Grave

Sideboard:
1 Blood Baron of Vizkopa
1 Detention Sphere
2 Rest in Peace
2 Infernal Reckoning
2 Mystical Dispute
1 Kambal, Consul of Allocation
1 Kunoros, Hound of Athreos
1 Languish
2 Rakdos's Return
1 Slaughter Games
1 Thought Erasure