وَلَا رَجُلٌ أَفْضَلَ مِنْكَ
Translation: And no man is better than you.
وَ: coordinating/resumptive particle.
لَا: negative particle working like laysa.
رَجُلٌ: nominative ism lā; indefinite noun.
أَفْضَلَ: accusative khabar lā; comparative noun/adjective.
مِنْكَ: min is a preposition; -ka is an attached genitive pronoun; phrase complements “better.”
The nominative, nunated رَجُلٌ is crucial; do not confuse it with the built-on-fatḥ رَجُلَ under lā of generic negation.