20 cards where the set is “eld” and the cards are cards found in Brawl decks

Mace of the Valiant (Throne of Eldraine #314)
Silverwing Squadron (Throne of Eldraine #315)
Faerie Formation (Throne of Eldraine #316)
Shimmer Dragon (Throne of Eldraine #317)
Workshop Elders (Throne of Eldraine #318)
Chittering Witch (Throne of Eldraine #319)
Taste of Death (Throne of Eldraine #320)
Embereth Skyblazer (Throne of Eldraine #321)
Steelbane Hydra (Throne of Eldraine #322)
Thorn Mammoth (Throne of Eldraine #323)
Alela, Artful Provocateur (Throne of Eldraine #324)
Banish into Fable (Throne of Eldraine #325)
Chulane, Teller of Tales (Throne of Eldraine #326)
Gluttonous Troll (Throne of Eldraine #327)
Knights' Charge (Throne of Eldraine #328)
Korvold, Fae-Cursed King (Throne of Eldraine #329)
Syr Gwyn, Hero of Ashvale (Throne of Eldraine #330)
Arcane Signet (Throne of Eldraine #331)
Tome of Legends (Throne of Eldraine #332)
Command Tower (Throne of Eldraine #333)

Though this query has ended, its relics still slumber in New Argive.