Worthy Cost {B}
Sorcery
As an additional cost to cast this spell, sacrifice a creature.
Exile target creature or planeswalker.
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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.
Flay Essence 99%
$0.16#15342
"Exile target creature or planeswalker. You gain life equal to the number of counters on it."
Angelic Ascension 97%
$0.21#11370
"Exile target creature or planeswalker. Its controller creates a 4/4 white Angel creature token with flying."
The End 92%
$0.33#23207
"Exile target creature or planeswalker. Search its controller's graveyard, hand, and library for any number of cards with the same name as that permanent and exile them. That player shuffles, then draws a card for each card exiled from their hand this way."
Galvanic Discharge 82%
$0.21#6330
"Choose target creature or planeswalker. You get {E}{E}{E} , then you may pay any amount of {E}. this card deals that much damage to that permanent."
Tendrils of Despair 100%
$0.17#26489
"As an additional cost to cast this spell, sacrifice a creature."
Demon of Catastrophes 100%
$0.32#14830
"As an additional cost to cast this spell, sacrifice a creature."