{No Mercy}
{Safe Passage}
{Curse of the Nightly Hunt}
Won't work, because {safe passage} blocks the damage. Read the ruling on {no mercy}, it specifies that if the damage is all prevented, no damage was dealt to you
You don't even have to read the ruling. Just read the card.
"When a creature successfully deals damage to you."
Which translates to "when you lose life, due to a creature dealing damage".
Keep thinking and trying different cards in this and you'll get it. There are different ways. Keep thinking. 😉
Dang!
Ok then drop the passage for a {Becon of Immortality} and take the damage!
and if they still do lethal?
Just replace {Safe PAssage} with {humility}.
Or have {platinum angel} on the battlefield.