Boros Fires
A Pioneer deck, by aspiringspike
5th place at a tournament on 2020-03-21

Maindeck:

Enchantments
2 Banishing Light
4 Chained to the Rocks
1 Dawn of Hope
2 Elspeth Conquers Death
4 Fires of Invention
4 Gideon's Intervention
1 Outpost Siege
1 Quarantine Field
1 Rest in Peace
1 Sigil of the Empty Throne
1 Sphere of Safety
1 The Akroan War
4 The Birth of Meletis

Legendary Enchantment Creatures
1 Heliod, Sun-Crowned

Legendary Planeswalkers
4 Karn, the Great Creator

Sorceries
4 Idyllic Tutor

Basic Lands
8 Mountain
5 Plains

Lands
1 Castle Ardenvale
2 Clifftop Retreat
4 Sacred Foundry
4 Temple of Triumph

Sideboard:
1 Aligned Hedron Network
1 Damping Sphere
1 Glass Casket
1 Pithing Needle
1 Ring of Three Wishes
1 Tormod's Crypt
1 Walking Ballista (Banned in Pioneer)
1 Alpine Moon
1 Sphere of Safety
1 God-Pharaoh's Statue
1 Skysovereign, Consul Flagship
2 Chandra, Awakened Inferno
1 Chandra, Torch of Defiance
1 Darksteel Citadel