Moctus of Elysium

Flying, Vigilance, Lifelink
At the beginning of your upkeep or end step
your life total becomes your starting life total.
If you would lose the game you may exile
Moctus of Elysium instead and your life total
becomes double your starting life total, gaining
life this way can't be prevented.

I don't know who I was in life but in death I am a protector of Elysium.