15 cards where the text includes “changeling” and the color identity ≤ G

Birthing Boughs (Modern Horizons #221)
Bloodline Pretender (March of the Machine Commander #350)
Chameleon Colossus (Forgotten Realms Commander #153)
Changeling Titan (Lorwyn #200)
Faceless Agent (Jumpstart: Historic Horizons #1)
Game-Trail Changeling (Morningtide #123)
Gladewalker Ritualist (Kaldheim #392)
Guardian Gladewalker (Kaldheim #174)
Littjara Glade-Warden (Kaldheim #182)
Masked Vandal (Kaldheim #184)
Maskwood Nexus (Commander Legends: Battle for Baldur's Gate #865)
Realmwalker (The Lost Caverns of Ixalan Commander #250)
Universal Automaton (Modern Horizons #235)
Webweaver Changeling (Double Masters 2022 #164)
Woodland Changeling (Lorwyn #242)

This search is finished. Now the real work can begin.