Four-Color Delver
A Legacy deck, by ho-oh
5th place at a tournament in Magic Online on 2020-06-04

Maindeck:

Creatures
4 Delver of Secrets
3 Dreadhorde Arcanist (Banned in Legacy)
2 Ethereal Forager
3 Tarmogoyf

Instants
4 Brainstorm
4 Daze
2 Force of Negation
4 Force of Will
4 Lightning Bolt
1 Spell Pierce
4 Swords to Plowshares

Legendary Planeswalkers
2 Oko, Thief of Crowns (Banned in Legacy)

Sorceries
4 Ponder

Lands
4 Misty Rainforest
4 Scalding Tarn
1 Taiga
2 Tropical Island
2 Tundra
2 Volcanic Island
4 Wasteland

Sideboard:
1 Winter Orb
1 Containment Priest
2 Meddling Mage
1 Cindervines
1 Stony Silence
1 Sylvan Library
2 Pyroblast
2 Surgical Extraction
2 Veil of Summer
1 Klothys, God of Destiny
1 Fiery Justice