58 cards where the lore includes “elk”

Auspicious Starrix (Ikoria: Lair of Behemoths #144)
Axebane Stag (Return to Ravnica #116)
Bellowing Elk (Modern Horizons #157)
Beza, the Bounding Spring (Bloomburrow #2)
Burnished Hart (Foundations #250)
Cold-Eyed Selkie (Outlaws of Thunder Junction Commander #218)
Dawnglade Regent (Commander Legends #222)
Dawntreader Elk (Jumpstart #387)
Draining Whelk (Time Spiral Remastered #62)
Elk (Outlaws of Thunder Junction Tokens #13)
Elkin Bottle (Masters Edition II #207)
Elkin Lair (Visions #78)
Enduring Vitality (Duskmourn: House of Horror #176)
Ethereal Elk (Core Set 2020 #299)
Fey Steed (Forgotten Realms Commander #5)
Galewind Moose (Bloomburrow #173)
Gang of Elk (Seventh Edition #247)
Glimmerpoint Stag (Eternal Masters #12)
Golden Hind (Journey into Nyx #124)
Great Hart (Born of the Gods #15)
Great Sable Stag (Magic 2010 #186)
Hammerfist Giant (Commander Anthology Volume II #103)
Heliod's Emissary (Theros #18)
Hidden Stag (Urza's Saga #265)
Highland Game (Core Set 2019 #188)
Jegantha, the Wellspring (Ikoria: Lair of Behemoths #222)
Kenrith's Transformation (Forgotten Realms Commander #162)
Loathsome Chimera (Theros Beyond Death #177)
Mirkwood Elk (Tales of Middle-earth Commander #41)
Mournwhelk (Lorwyn #127)
Myntasha, Honored One (2019 Heroes of the Realm #5)
Oko, the Ringleader (Outlaws of Thunder Junction #223)
Oko, Thief of Crowns (Throne of Eldraine #197)
Rain of Gore (Dissension #126)
Rimefur Reindeer (Wilds of Eldraine #27)
Sacred White Deer (Global Series Jiang Yanggu & Mu Yanling #25)
Saddled Rimestag (Modern Horizons #177)
Selkie Hedge-Mage (Eventide #158)
Shelkin Brownie (Legends #204)
Somberwald Stag (Jumpstart #431)
Splendor Mare (Ikoria: Lair of Behemoths #32)
Springmane Cervin (Strixhaven: School of Mages #144)
Stampeding Elk Herd (Dragons of Tarkir #208)
Star-Crowned Stag (Core Set 2019 #38)
Storybook Ride (Unfinity #229b)
Tempest Hart // Scan the Clouds (Wilds of Eldraine #238)
The Highland Runner (Unknown Event #RW06b)
The Pride of Hull Clade (Murders at Karlov Manor #172)
Trickster's Elk (Modern Horizons 3 #175)
Vernal Sovereign (Ravnica: Clue Edition #51)
Watchful Radstag (Fallout #87)
Welkin Guide (Eternal Masters #36)
Welkin Hawk (Exodus #25)
Welkin Tern (Global Series Jiang Yanggu & Mu Yanling #5)
Wetland Sambar (Khans of Tarkir #62)
Windborn Muse (Dominaria Remastered #415)
Wistful Selkie (Commander 2015 #243)
Wrath of Oko (Unknown Event #RU03b)

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