Machining Bagworm

:Forerunner :If you have a vanguard with "Machining" in its card name, this unit gets ":[ this unit] If the number of your opponent's units is zero, 1, and if it is not, choose one of your opponent's rear-guards, and it.". :[Put this unit into your soul] Choose one of your rear-guards with "Machining" in its card name, and it.