Book of Lehi

Your creatures are also Clerics.
Creatures who were already Clerics gain:
Prophecy exert {t}: Target creature gains double Power/Toughness until the end of turn.
For behold, it came to pass after my father
had made an end of speaking the words of his
dream, and also of exhorting them to all diligence,
he spake unto them concerning the Jews
-1 Nephi 10:2