Just had a game where I had Nine Lives out (After 9 instances of damage dealt to me , "you lose the game") and Cloudsteel Kirin ("You can't lose the game and your opponents can't win the game"). Kirin was attached to another creature.
I sac'd off Nine Lives in order to buff a creature via ability and it caused me to lose despite Kirins ability that I cannot lose the game.
The interraction ultimately makes no sense; to have a card trigger override the ability of another card that should nullify it is counter-intuitive and unfortunately cost me a winnable game. So either the wording of either card needs looking into, adjustment made to the intertaction or there needs to be some priority clarity so the interraction makes sense.