46 cards where (the card types include “legendary” and the card types include “knight”) and the color identity ≤ BRW and (the card is available on Paper) and it’s legal in Commander

Adeline, Resplendent Cathar (March of the Machine Commander #167)
Adriana, Captain of the Guard (Dominaria United Commander #139)
Arvad the Cursed (March of the Machine Commander #317)
Aryel, Knight of Windgrace (Commander Masters #336)
Balan, Wandering Knight (Commander Masters #16)
Bartolomé del Presidio (The Lost Caverns of Ixalan #224)
Danitha, Benalia's Hope (Dominaria United #15)
Danitha Capashen, Paragon (Commander Masters #20)
Edgar Markov (Commander 2017 #36)
Elder Arthur Maxson (Fallout #102)
Elenda, the Dusk Rose (The Lost Caverns of Ixalan Commander #268)
Éomer, Marshal of Rohan (The Lord of the Rings: Tales of Middle-earth #120)
Éomer of the Riddermark (The Lord of the Rings: Tales of Middle-earth #121)
Éowyn, Fearless Knight (The Lord of the Rings: Tales of Middle-earth #201)
Haakon, Stromgald Scourge (March of the Machine Commander #252)
Ihsan's Shade (Masters 25 #94)
Imodane, the Pyrohammer (Wilds of Eldraine #137)
Inti, Seneschal of the Sun (The Lost Caverns of Ixalan #156)
Josu Vess, Lich Knight (March of the Machine Commander #253)
Kwende, Pride of Femeref (Dominaria #25)
Lena, Selfless Champion (Jumpstart #117)
Livio, Oathsworn Sentinel (Commander Legends #31)
Márton Stromgald (Ice Age #199)
Merry, Esquire of Rohan (The Lord of the Rings: Tales of Middle-earth #215)
Nadaar, Selfless Paladin (Adventures in the Forgotten Realms #27)
Olivia, Mobilized for War (Shadows over Innistrad #248)
Paladin Danse, Steel Maverick (Fallout #20)
Paladin Elizabeth Taggerdy (Fallout #114)
Rem Karolus, Stalwart Slayer (Innistrad: Midnight Hunt #235)
Ria Ivor, Bane of Bladehold (Phyrexia: All Will Be One #214)
Sarevok, Deathbringer (Commander Legends: Battle for Baldur's Gate #144)
Sentinel Sarah Lyons (Fallout #118)
Shanid, Sleepers' Scourge (Dominaria United Commander #4)
Sidar Jabari (Mirage #39)
Sylvia Brightspear (Battlebond #10)
Syr Alin, the Lion's Claw (Throne of Eldraine #32)
Syr Carah, the Bold (Throne of Eldraine #145)
Syr Ginger, the Meal Ender (Wilds of Eldraine #252)
Syr Gwyn, Hero of Ashvale (Throne of Eldraine #330)
Syr Konrad, the Grim (Murders at Karlov Manor Commander #141)
Telim'Tor (Mirage #197)
Tivadar of Thorn (Time Spiral #44)
Tori D'Avenant, Fury Rider (Dominaria United #223)
Varchild, Betrayer of Kjeldor (Commander 2018 #28)
Vona, Butcher of Magan (The Lost Caverns of Ixalan Commander #293)
Xenk, Paladin Unbroken (Secret Lair Drop #1237)

It is the moment of discovery, the triumph of the mind, and the end of these results.