Get-MVAttributeUsage.ps1

$Schema = Get-MVSchema
$Attribute = "DisplayName"

if($Schema.Attributes.Keys -contains $Attribute){
    Write-Host "Attribute in MV schema"

    foreach($Key in $Schema.ObjectClasses.Keys){
        $Attributes = $Schema.ObjectClasses.$Key.Attributes.Keys
        if($Attributes -contains $Attribute){
            Write-Host "Binding on: " $Key
        }
    }

}else{
    Write-Host "Attribute NOT in MV schema"
}