At the beginning of your end step, Conjurer's Closet triggers, blinking Sage of Hours.
Sage of Hours entering the battlefield triggers Remnant of the Rising Star, causing you to pay ({5} magic symbol) to put five +1/+1 counters on Sage of Hours.
Activate Sage of Hours by removing all +1/+1 counters from it, taking at least one extra turn after this one.