Demonic Devourer

Whenever Demonic Devourer deals combat
damage to a creature during your turn, destroy
that creature or it's controller loses life equal to
its converted mana cost.
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It craves the blood of the living, and drags them down
to the underworld to become it's next victim. It feasts
upon them, and inhales their fear as they scream from
the pain that it inflicts.