I see it as a requirement to play one because if you are attempting to win with Serra Angel and there is a Maze of Ith (commonly restricted) in play, you need more ways to destroy it than a single Chaos Orb (although Stasis is another solution to Maze after the first activation)
The cards you draw with Embrace are, unfortunately, temporary, but that hardly matters when you consider the raw card advantage it can get you over the course of a game
There is a veritable mandelbrot set of tangents to go off on already
Spells and abilities that would normally cause you to gain or lose life still resolve while your life total can't change, but the life-gain or life-loss part simply has no effect
So far, weve seen job cards for the likes of Dragoon, Summoner, Black Mage, and White Mage, each of which has its own effects and boosts