18 cards where the text includes “changeling” and the card types include “creature” and the color identity ≤ BW and it’s legal in Commander

Avian Changeling (Modern Masters #6)
Barkform Harvester (Bloomburrow #243)
Bloodline Pretender (March of the Machine Commander #350)
Cairn Wanderer (Commander 2020 #130)
Changeling Hero (Lorwyn #9)
Changeling Outcast (Outlaws of Thunder Junction Commander #128)
Changeling Sentinel (Morningtide #6)
Ghostly Changeling (Modern Masters 2015 #83)
Graveshifter (March of the Machine Commander #251)
Impostor of the Sixth Pride (Modern Horizons #14)
Irregular Cohort (Commander Legends: Battle for Baldur's Gate #696)
Mirror Entity (Outlaws of Thunder Junction Commander #83)
Moonglove Changeling (Morningtide #67)
Skeletal Changeling (Lorwyn #140)
Three Tree Mascot (Foundations #682)
Universal Automaton (Modern Horizons #235)
Valiant Changeling (Commander Legends: Battle for Baldur's Gate #711)
Venomous Changeling (Modern Horizons #114)

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