Sangrophage {B}{B}
Creature — Zombie
At the beginning of your upkeep, tap this creature unless you pay 2 life.
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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.
Heavyweight Demolisher 97%
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"At the beginning of your upkeep, tap this creature unless you pay {3}."
Apocalypse Demon 90%
$0.28#15673
"At the beginning of your upkeep, tap this creature unless you sacrifice another creature."
Demonic Hordes 89%
#24808
"At the beginning of your upkeep, unless you pay {B}{B}{B}, tap this creature and sacrifice a land of an opponent's choice."
Devouring Sugarmaw // Have for Dinner 87%
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"At the beginning of your upkeep, you may sacrifice an artifact, enchantment, or token. If you don't, tap this creature."