Karthus, Deathsinger

Whenever Karthus dies, target creature gets -2/-2
for each copy of Karthus, Deathsinger in your graveyard.
{b}{b}{b}, Exile all cards named Karthus,
Deathsinger from your graveyard: All creatures
get -X/-X, where X is the number of cards exiled
this way.
"Listen and rejoice in death!"