19 cards where the text includes “changeling” and the colors ≤ UW and (the rarity is equal to common or the rarity is equal to uncommon)

Amoeboid Changeling (Lorwyn #51)
Avian Changeling (Modern Masters #6)
Birthing Boughs (Modern Horizons #221)
Bloodline Pretender (March of the Machine Commander #350)
Changeling Hero (Lorwyn #9)
Changeling Sentinel (Morningtide #6)
Crib Swap (Commander Legends: Battle for Baldur's Gate #690)
Ego Erasure (Lorwyn #59)
Faceless Agent (Jumpstart: Historic Horizons #1)
Impostor of the Sixth Pride (Modern Horizons #14)
Irregular Cohort (Commander Legends: Battle for Baldur's Gate #696)
Littjara Kinseekers (Kaldheim #66)
Mistwalker (Kaldheim #68)
Mothdust Changeling (Modern Masters #53)
Shields of Velis Vel (Lorwyn #39)
Turtleshell Changeling (Lorwyn #94)
Universal Automaton (Modern Horizons #235)
Valiant Changeling (Commander Legends: Battle for Baldur's Gate #711)
Wings of Velis Vel (Modern Masters 2015 #70)

In the blink of an eye, they strode from deep snow to the end of this search.