Yorion Five-Color Niv-Mizzet
A Pioneer deck, by osodan
8th place at a tournament in Magic Online on 2020-05-20

Maindeck:

Creatures
3 Arboreal Grazer
1 Knight of Autumn
1 Paradise Druid
1 Siege Rhino
4 Sylvan Caryatid

Instants
2 Abrupt Decay
3 Fatal Push
1 Utter End

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

Legendary Enchantments
2 Oath of Kaya

Legendary Planeswalkers
2 Nahiri, the Harbinger
4 Teferi, Time Raveler (Banned in Pioneer)

Sorceries
4 Bring to Light
1 Dreadbore
1 Extinction Event
1 Hour of Devastation
2 Thought Erasure
1 Unmoored Ego

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

Lands
4 Breeding Pool
4 Fabled Passage
1 Glacial Fortress
1 Godless Shrine
1 Indatha Triome
1 Ketria Triome
3 Mana Confluence
2 Overgrown Tomb
1 Raugrin Triome
1 Rootbound Crag
1 Sacred Foundry
1 Savai Triome
1 Stomping Ground
1 Sunpetal Grove
1 Temple Garden
1 Temple of Deceit
1 Temple of Enlightenment
1 Temple of Plenty
1 Watery Grave
1 Woodland Cemetery
2 Zagoth Triome

Sideboard:
1 Sorcerous Spyglass
1 Despark
1 Fatal Push
1 Kambal, Consul of Allocation
2 Kunoros, Hound of Athreos
1 Questing Beast
1 Yorion, Sky Nomad
1 Casualties of War
1 Cry of the Carnarium
1 Enter the God-Eternals
1 Rakdos's Return
1 Slaughter Games
2 Thoughtseize