So tough, considering we can't get other Charms from it. Still, [My Name] Cosmic Principle would make me ageless. Although, I could still be killed by something. So, maybe [My Name] Eternal Essence - I'd die of old age, but in the mean time, I'm invincible.
No, no. [My Name] Glory Incarnate. I'll die eventually, sure. But, in the mean time, I get 20 dice to everything (barring whatever weird exception I have built into me), and a big chunk of free XP. In the real world, where highly skilled professionals are throwing around 5-6 dice, and points of XP are going to be stupidly rare. And the only cost is the inability to ever grow as a person ever again.