Defiler of Souls 



Creature — Demon
Flying
At the beginning of each player's upkeep, that player sacrifices a monocolored creature of their choice.
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Cards that do something similar expected a card that isn't here?
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.
Woebringer Demon 86%
$0.25#20982
"At the beginning of each player's upkeep, that player sacrifices a creature of their choice. If the player can't, sacrifice this creature."
Kuon, Ogre Ascendant // Kuon's Essence 85%
$1.15#22177
"At the beginning of each player's upkeep, that player sacrifices a creature of their choice."
Call to the Grave 81%
$2.55#12778
"At the beginning of each player's upkeep, that player sacrifices a non-Zombie creature of their choice."