I have a question about changing traits on moribund cards.
Say I have in play Desert Exiles, which has the text "Response: After a Reinforcements card is played, draw a card." I also have a Maester with a Copper Link attached. For some reason, my opponent decides to play You've Killed the Wrong Dwarf! on my Maester, which kneels him. I trigger the response on the Copper Link and add the trait Reinforcements to You've Killed the Wrong Dwarf! Do I meet the requirements for triggering the response on Desert Exiles, or do I not because You've Killed the Wrong Dwarf! was not a Reinforcements card when it was played? Can I even add traits to events in this way?
Another example might be that I have a Maester of the Sun (with a Copper Link, and it's summer) out with at least one other character, and my opponent plays Valar. Maester kneels to save himself, I trigger response on Copper Link to turn another character that was just killed into a Sand Snake. Assuming I can pay the cost, can I play No Use for Grief from my hand, triggered off this new, dying Sand Snake? Or was it too little, too late for the Sand Snakes to not grieve over?