39 cards where (the card types include “knight” or the text includes “changeling”) and the colors is W and the mana value = 2 and it’s legal in Modern

Accorder Paladin (Mirrodin Besieged #1)
Ambitious Farmhand // Seasoned Cathar (Innistrad: Midnight Hunt #2)
Ambitious Farmhand // Seasoned Cathar (Innistrad: Midnight Hunt #2)
Benalish Cavalry (Time Spiral Remastered #7)
Benalish Honor Guard (Dominaria #5)
Capashen Knight (Magic 2014 #11)
Cavalry Drillmaster (Core Set 2019 #8)
Daring Skyjek (Gatecrash #9)
East-Mark Cavalier (The Lord of the Rings: Tales of Middle-earth #9)
Famished Paladin (Rivals of Ixalan #8)
Griffin Rider (Magic 2012 #20)
Heartflame Duelist // Heartflame Slash (Wilds of Eldraine #228)
Impostor of the Sixth Pride (Modern Horizons #14)
Knight of Cliffhaven (Duel Decks: Zendikar vs. Eldrazi #5)
Knight of Dawn's Light (Dominaria United #23)
Knight of Glory (Magic 2013 #21)
Knight of Grace (Dominaria #23)
Knight of Meadowgrain (Duel Decks: Knights vs. Dragons #5)
Knight of New Benalia (Dominaria #24)
Knight of the Holy Nimbus (Time Spiral Remastered #23)
Knight of the Skyward Eye (Masters 25 #19)
Knight of the White Orchid (March of the Machine Commander #193)
Leonin Skyhunter (Duel Decks: Knights vs. Dragons #7)
Lone Rider // It That Rides as One (Eldritch Moon #33)
Lone Rider // It That Rides as One (Eldritch Moon #33)
Norn's Inquisitor (March of the Machine #29)
Order of the Golden Cricket (Morningtide #19)
Paladin of Atonement (Rivals of Ixalan #16)
Puresteel Paladin (Commander Masters #51)
Sigiled Paladin (Shards of Alara #27)
Spectral Rider (Innistrad #35)
Steadfast Paladin (Adventures in the Forgotten Realms #38)
Swordsworn Cavalier (March of the Machine #42)
Tempered Veteran (Core Set 2021 #41)
Vanguard of the Rose (The Lost Caverns of Ixalan #42)
Veteran Cavalier (Ninth Edition #52)
Westfold Rider (The Lord of the Rings: Tales of Middle-earth #37)
White Knight (Duel Decks: Knights vs. Dragons #9)
White Shield Crusader (Coldsnap #24)
Worthy Knight (March of the Machine Commander #217)
Youthful Knight (Throne of Eldraine #37)

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