52 cards where the cards aren’t reprints and the card is tagged “changeling”

Realmwalker (Kaldheim #188)
Changeling Outcast (Modern Horizons #82)
Mirror Entity (Lorwyn #31)
Taurean Mauler (Morningtide #109)
Bloodline Pretender (Kaldheim #235)
Masked Vandal (Kaldheim #184)
Morophon, the Boundless (Modern Horizons #1)
Universal Automaton (Modern Horizons #235)
Crib Swap (Lorwyn #11)
Graveshifter (Modern Horizons #94)
Mothdust Changeling (Morningtide #42)
Irregular Cohort (Modern Horizons #15)
Unsettled Mariner (Modern Horizons #216)
Chameleon Colossus (Morningtide #116)
Orvar, the All-Form (Kaldheim #70)
Amoeboid Changeling (Lorwyn #51)
Moritte of the Frost (Kaldheim #223)
Guardian Gladewalker (Kaldheim #174)
Impostor of the Sixth Pride (Modern Horizons #14)
Shields of Velis Vel (Lorwyn #39)
Woodland Changeling (Lorwyn #242)
Shapesharer (Lorwyn #85)
Avian Changeling (Lorwyn #4)
Three Tree Mascot (Bloomburrow #251)
Venomous Changeling (Modern Horizons #114)
Valiant Changeling (Modern Horizons #34)
Skeletal Changeling (Lorwyn #140)
Nameless Inversion (Lorwyn #128)
Barkform Harvester (Bloomburrow #243)
Cairn Wanderer (Lorwyn #105)
Fire-Belly Changeling (Lorwyn #164)
Blades of Velis Vel (Lorwyn #152)
Mistwalker (Kaldheim #68)
Formless Genesis (Duskmourn: House of Horror Commander #34)
Changeling Berserker (Lorwyn #160)
Webweaver Changeling (Modern Horizons #192)
Changeling Titan (Lorwyn #200)
Wings of Velis Vel (Lorwyn #97)
Game-Trail Changeling (Morningtide #123)
Moonglove Changeling (Morningtide #67)
Littjara Kinseekers (Kaldheim #66)
Changeling Hero (Lorwyn #9)
Ghostly Changeling (Lorwyn #116)
Littjara Glade-Warden (Kaldheim #182)
War-Spike Changeling (Morningtide #112)
Changeling Sentinel (Morningtide #6)
Gladewalker Ritualist (Kaldheim #392)
Turtleshell Changeling (Lorwyn #94)
Mistform Ultimus (Legions #47)
Ego Erasure (Lorwyn #59)
Dr. Julius Jumblemorph (Unstable #130)
Shapeshifter (Duskmourn Commander Tokens #1)

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