The Nexus

Whenever a creature you control dies, if it has a
nexial binding counter on it, exile it and create a
soul token. Othewise, return it to the battlefield
with a nexial binding counter on it.
If your life total is less than or equal to half your starting life total, you get an emblem with "As
long as you control an artifact, damage that
would reduce your life total to less than 1
reduces it to 1 instead."