There are many synonyms for the phrase "be the power of." Some alternatives include "dominate," "influence," "command," "control," "govern," "direct," "rule," "sway," "guide," "manage," "superintend," "oversee," "supervise," "regulate," and "manipulate." These words can be used to describe various situations, from a person or group exerting power over others to a situation where a force or idea is dominating a particular outcome. Using synonyms can help to add variety and nuance to your writing, as well as help you to clarify your meaning and communicate more effectively.