Joseph, Wandering Protector

First strike, vigilance
Whenever Joseph, Wandering Protector would be dealt exactly enough damage to destroy him, you may prevent one of that damage. Do this only once each turn.
"I witnessed the destruction of Earthrealm. I failed to save Tommia, thrice. I lost everything, even my planeswalker spark. But I'll stop at nothing to make sure no one else has to suffer as I have."