Magnanimous Magistrate has at least one reprieve counter.
Steps
Activate Ashnod's Altar by sacrificing Martyr for the Cause, adding ({C} magic symbol) ({C} magic symbol) .
Martyr for the Cause dies, triggering itself and Magnanimous Magistrate.
Resolve the Martyr for the Cause trigger, causing you to proliferate, putting two reprieve counters on Magnanimous Magistrate.
Resolve the Magnanimous Magistrate trigger, causing you to remove two reprieve counters from Magnanimous Magistrate and return Martyr for the Cause from your graveyard to the battlefield.