Hilda's black card
So it says on the wiki that she meant it for Miria but Ophelia got it and ripped it up.
http://claymore.wikia.com/wiki/Hilda
Did this only happen in the manga? I just remember Miria killing the awakened Hilda before knowing who it was then Ophelia appearing behind her hoping she would awaken, nothing about Hilda sending a black card.