Sorrowful Messenger

Flying, Vigilance
Dying Wish {w}{w}{w}{w}{w} (When a creature you control dies, you may play this card as if it had Flash for its Dying Wish cost)
When this card enters the battlefield, if its dying wish cost was paid: You gain 5 life.
Every letter he carries is written by one of the dead, last letters written in the afterlife to apologize to loved ones.