Kherian, Seeker of Secrets

Lifetouch(This creature heals for its power during the damage step rather than dealing damage.)
Kherian, Seeker of Secrets power and toughness are each equal to your life total.
Whenever an opponent gains 10 or more life,
draw a card and gain 5 life.
Whenever an opponent gains 40 or more life, put five +1/+1 counters on Kherian, Seeker of Secrets
Whenever an opponent gains 160 or more life,
you win the game.