Kiss of Hades

{b}{t}, Discard a card: Exile target creature
from a graveyard. Gain X mana, where X is
half of the creature's converted mana cost.

{2}{b}{t}: Choose an exiled creature you own.
Reveal it, then return it to the battlefield. It is
a black 3/3 Yugoloth creature token.

"No rest for the wicked."