Vile Requiem is a uncommon Enchantment card from Commander 2013 (C13), collector number 98. Current market price: $0.14, TCGplayer market prices via Scryfall.
At the beginning of your upkeep, you may put a verse counter on this enchantment. {1}{B}, Sacrifice this enchantment: Destroy up to X target nonblack creatures, where X is the number of verse counters on this enchantment. They can't be regenerated.