مَا قَامَ إِلَّا زَيْدٌ
No one stood except Zayd.
The negative particle first excludes the attribution within a relevant domain; illā then retains Zayd as the exception. This provides a different rhetorical path from the simple assertion “Zayd stood.”
It may suit an uninformed listener or one who has selected a wrong actor. Whether the restriction is actual, relative, specifying, or reversing depends on context.