Tha, Machine God of Equity

Indestructible. Vigilance.
Tha, Machine God of Equity, is not a
creature until "Machine Oath Gate" is on the battlefield.
Tha, Machine God of Equity is also an
Legendary Artifact creature.
Each player draws per draw step, untaps
per untap step, and shares a life total.
You do not lose the game if your
life total drops below 0.