Lilix, Maestra Sorceri

Morbid - Whenever you cast an instant or sorcery spell that targets a creature, if a creature died this turn, the targeted creature's controller discards a card. Then, if the discarded card was a creature, Lilix, Maestra Sorceri deals X damage to target creature or player, where X is the discarded creature's power.
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"I'm afraid your sacrifice will only bring more suffering to the masses."