God Choinganus

If God Choinganus is your commander, note your life total at your upkeep.
When God Choinganus enters the battlefield, deal X damage to any target
where X is the difference between your current and noted life total
When you gain life, God Choinganus gets a 1+/1+ counter on it.
When you lose life, God Choinganus does that
much damage plus 3 to any target.