20 cards where the text includes “add” and (the card types include “legendary” and the card types include “elf”)

Arwen, Weaver of Hope (Tales of Middle-earth Commander #35)
Belbe, Corrupted Observer (Commander Legends #270)
Furgul, Quag Nurturer (Alchemy: Murders at Karlov Manor #23)
Galadriel, Light of Valinor (Tales of Middle-earth Commander #498)
Gilanra, Caller of Wirewood (Commander Legends #230)
Grand Warlord Radha (Dominaria #195)
Gwenna, Eyes of Gaea (The Brothers' War #185)
Halsin, Emerald Archdruid (Commander Legends: Battle for Baldur's Gate #234)
Jaheira, Friend of the Forest (Commander Legends: Battle for Baldur's Gate #237)
Kalain, Reclusive Painter (Adventures in the Forgotten Realms #225)
Marwyn, the Nurturer (Kaldheim Commander #68)
Meria, Scholar of Antiquity (Dominaria United #206)
Mina and Denn, Wildborn (Zendikar Rising Commander #94)
Nissa, Resurgent Animist (March of the Machine: The Aftermath #22)
Radha, Heir to Keld (Dominaria Remastered #196)
Rishkar, Peema Renegade (Commander Masters #317)
Rofellos, Llanowar Emissary (Vintage Masters #229)
Selvala, Eager Trailblazer (Outlaws of Thunder Junction #231)
Selvala, Explorer Returned (Murders at Karlov Manor Commander #218)
Selvala, Heart of the Wilds (Commander Masters #320)

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