Doomsday
A Legacy deck, by monkeyscantcry
1st place at a tournament in Magic Online on 2020-10-11

Maindeck:

Artifacts
1 Lion's Eye Diamond
3 Lotus Petal

Creatures
2 Street Wraith
1 Thassa's Oracle

Instants
4 Brainstorm
4 Dark Ritual
4 Daze
4 Force of Will
1 Lim-Dul's Vault

Sorceries
4 Doomsday
4 Duress
1 Edge of Autumn
1 Ideas Unbound
1 Night's Whisper
4 Ponder
4 Preordain

Basic Lands
1 Island
1 Swamp

Lands
1 Bayou
1 Cavern of Souls
4 Misty Rainforest
4 Polluted Delta
1 Tropical Island
3 Underground Sea
1 Verdant Catacombs

Sideboard:
2 Defense Grid
2 Tormod's Crypt
2 Carpet of Flowers
3 Abrupt Decay
1 Ensnare
2 Flusterstorm
1 Surgical Extraction
2 Veil of Summer