Helm of Unending Rule

Helm of Unending Rule can be your commander
Equipped creature has base power and toughness 6/6 and is a legendary creature named "Xensor, the Tyrant" and has "If a creature dealt damage by Xensor, the Tyrant would be put into the graveyard or exile this turn return it to the battlefield under your control, it is a specter in addition to its other types"
If a spell or ability would destroy Helm of Unending Rule sacrifice equipped creature instead.
Equip: pay 4 life