Zirda Bant Karn
A Legacy deck, by CoolUser
2nd place at a tournament in Magic Online on 2020-04-30

Maindeck:

Artifacts
4 Grim Monolith

Artifact Creatures
3 Walking Ballista

Instants
4 Brainstorm
3 Force of Will
3 Spell Pierce
4 Swords to Plowshares
1 Veil of Summer

Legendary Planeswalkers
4 Karn, the Great Creator
3 Oko, Thief of Crowns (Banned in Legacy)
2 Teferi, Time Raveler

Snow Artifacts
3 Arcum's Astrolabe (Banned in Legacy)

Sorceries
4 Ponder
1 Preordain
1 Supreme Verdict

Basic Snow Lands
2 Snow-Covered Island
2 Snow-Covered Plains

Lands
1 Ancient Tomb
4 Flooded Strand
2 Misty Rainforest
2 Polluted Delta
1 Scalding Tarn
2 Tropical Island
2 Tundra
1 Windswept Heath

Legendary Lands
1 Karakas

Sideboard:
1 Basalt Monolith
1 Ensnaring Bridge
1 Mycosynth Lattice
1 Relic of Progenitus
1 Tormod's Crypt
1 Walking Ballista
1 Disenchant
1 Flusterstorm
2 Force of Negation
1 Force of Will
1 Veil of Summer
1 Zirda, the Dawnwaker (Banned in Legacy)
1 Council's Judgment
1 Supreme Verdict