In Ephesians 3:8, how does Paul describe himself?

Answer: Less than the least of all saints

Though less than the least of all the saints, Paul was given grace to preach to the Gentiles the unsearchable riches of Christ.

“Though I am less than the least of all the saints, this grace was given me: to preach to the Gentiles the unsearchable riches of Christ,”— Ephesians 3:8 (BSB)