Extravagant Spirit {3}{U}
Creature — Spirit
Flying
At the beginning of your upkeep, sacrifice this creature unless you pay {1} for each card in your hand.
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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.
Molting Harpy 85%
$0.16#30455
"At the beginning of your upkeep, sacrifice this creature unless you pay {2}."
Gurzigost 84%
$0.42#28287
"At the beginning of your upkeep, sacrifice this creature unless you put two cards from your graveyard on the bottom of your library."
Shadowborn Demon 82%
$0.46#16251
"At the beginning of your upkeep, if there are fewer than six creature cards in your graveyard, sacrifice a creature."
Endless Wurm 81%
$1.99#26828
"At the beginning of your upkeep, sacrifice this creature unless you sacrifice an enchantment."
Deep Spawn 81%
#28117
"At the beginning of your upkeep, sacrifice this creature unless you mill two cards."