You can choose one
What power would you want? 
@LukeAlmighty invisibility to time?
@Sabex
No, invisibility while you want to be invisible.
Because we don't have a different word for people who are invisible against their will, and those, who can control it.
@LukeAlmighty that would be "temporary invisibility"?
@LukeAlmighty don't take it as a criticism, I'm a pedant