36 cards where the color identity ≤ BW and (the card types include “sliver” or the text includes “changeling”) and the rarity is equal to common

Armor Sliver (Tempest Remastered #4)
Avian Changeling (Modern Masters #6)
Barkform Harvester (Bloomburrow #243)
Basal Sliver (Time Spiral #96)
Changeling Outcast (Outlaws of Thunder Junction Commander #128)
Changeling Sentinel (Morningtide #6)
Clot Sliver (Commander Masters #861)
Crib Swap (Commander Legends: Battle for Baldur's Gate #690)
Crypt Sliver (Commander Masters #863)
Enduring Sliver (Modern Horizons #6)
Faceless Agent (Jumpstart: Historic Horizons #1)
Frenzy Sliver (Future Sight #85)
Ghostly Changeling (Modern Masters 2015 #83)
Impostor of the Sixth Pride (Modern Horizons #14)
Irregular Cohort (Commander Legends: Battle for Baldur's Gate #696)
Lancer Sliver (Modern Horizons #18)
Lymph Sliver (Time Spiral Remastered #25)
Metallic Sliver (Tempest Remastered #226)
Mindlash Sliver (Time Spiral #118)
Moonglove Changeling (Morningtide #67)
Nameless Inversion (Modern Masters 2015 #87)
Plated Sliver (Legions #19)
Poultice Sliver (Planar Chaos #11)
Sentinel Sliver (Commander Masters #835)
Shields of Velis Vel (Lorwyn #39)
Sidewinder Sliver (Time Spiral Remastered #43)
Sinew Sliver (Commander Masters #837)
Skeletal Changeling (Lorwyn #140)
Sliver Construct (Magic 2014 #218)
Spitting Sliver (Planar Chaos #80)
Talon Sliver (Tempest #50)
Three Tree Mascot (Foundations #682)
Universal Automaton (Modern Horizons #235)
Venomous Changeling (Modern Horizons #114)
Venser's Sliver (Time Spiral #267)
Watcher Sliver (Time Spiral Remastered #49)

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