At the beginning of your end step, each opponent loses life equal to the number of tapped creatures you control.
"When the Second Sun rests between the horns on the horizon, so begins the Hour of Revelation. Then the Hour of Glory, the Hour of Promise, and finally the Hour of Eternity." —The Accounting of Hours
Amonkhet Promos (pAKH)
Illustrated by: Titus Lunter