Whipstitched Zombie {1}{B}
Creature — Zombie
At the beginning of your upkeep, sacrifice this creature unless you pay {B}.
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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.
Pit Spawn 92%
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"At the beginning of your upkeep, sacrifice this creature unless you pay {B}{B}."
Junún Efreet 92%
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"At the beginning of your upkeep, sacrifice this creature unless you pay {B}{B}."
Pit Raptor 84%
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"At the beginning of your upkeep, sacrifice this creature unless you pay {2}{B}{B}."
Razormane Masticore 83%
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"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Molten-Tail Masticore 83%
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"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Masticore 83%
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"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Endless Wurm 81%
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"At the beginning of your upkeep, sacrifice this creature unless you sacrifice an enchantment."
Anurid Scavenger 81%
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"At the beginning of your upkeep, sacrifice this creature unless you put a card from your graveyard on the bottom of your library."