Pit Spawn {4}{B}{B}{B}
Creature — Demon
First strike
At the beginning of your upkeep, sacrifice this creature unless you pay {B}{B}.
Whenever this creature deals damage to a creature, exile that creature.
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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.
Junún Efreet 100%
#31374
"At the beginning of your upkeep, sacrifice this creature unless you pay {B}{B}."
Whipstitched Zombie 92%
$0.08#31362
"At the beginning of your upkeep, sacrifice this creature unless you pay {B}."
Pit Raptor 89%
$0.19#30981
"At the beginning of your upkeep, sacrifice this creature unless you pay {2}{B}{B}."
+1 more matching line
Grasping Giant 88%
$0.59#19611
"Whenever this creature becomes blocked by a creature, exile that creature until this creature leaves the battlefield."
Tephraderm 86%
$0.25#27563
"Whenever a creature deals damage to this creature, this creature deals that much damage to that creature."
Watchers of the Dead 80%
$0.13#21565
"Exile this creature: Each opponent chooses two cards in their graveyard and exiles the rest."
Kuro, Pitlord 80%
$0.55#17189
"At the beginning of your upkeep, sacrifice this card unless you pay {B}{B}{B}{B}."