Xathrid Demon {3}{B}{B}{B}
Creature — Demon
Flying, trample
At the beginning of your upkeep, sacrifice a creature other than this creature, then each opponent loses life equal to the sacrificed creature's power. If you can't sacrifice a creature, tap this creature and you lose 7 life.
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Cards that do something similar expected a card that isn't here?
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Rust Elemental 88%
$4.40#6909
"At the beginning of your upkeep, sacrifice another artifact. If you can't, tap this creature and you lose 4 life."