Xathrid Demon 
Creature — Demon
$0.46 #18204 0.20 17.1 years
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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Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
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"At the beginning of your upkeep, sacrifice another artifact. If you can't, tap this creature and you lose 4 life."
Jarad, Golgari Lich Lord78%
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"
, Sacrifice another creature: Each opponent loses life equal to the sacrificed creature's power."
, Sacrifice another creature: Each opponent loses life equal to the sacrificed creature's power."
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"At the beginning of your upkeep, sacrifice a creature other than this creature. If you can't, this creature deals 7 damage to you."
+1 more matching line
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$0.10↓#25436↓0.44↑16.4 years
"At the beginning of your upkeep, sacrifice a creature."
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"Flying, trample"
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", 
, Sacrifice a Cleric creature: Target player loses life equal to the sacrificed creature's power."
, , Sacrifice a Cleric creature: Target player loses life equal to the sacrificed creature's power."
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$0.18↓#211890.31↑11.4 years↓
", Sacrifice another Warrior creature: Target player loses X life and you gain X life, where X is the sacrificed creature's power."
, Sacrifice another Warrior creature: Target player loses X life and you gain X life, where X is the sacrificed creature's power."
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"At the beginning of your upkeep, sacrifice a creature."
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"Trample"
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"At the beginning of your upkeep, sacrifice a creature other than this creature."
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"Flying, trample"
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"At the beginning of your upkeep, sacrifice a creature."
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"At the beginning of your upkeep, tap this creature unless you sacrifice another creature."
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"At the beginning of your upkeep, sacrifice a creature."
+1 more matching line
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$0.76↑#166040.00↓19.9 years↑
"At the beginning of your upkeep, sacrifice a creature other than this creature. If you can't, this creature deals 7 damage to you."
+1 more matching line