Disrupt {U}
Instant
Counter target instant or sorcery spell unless its controller pays {1}.
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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.
Flusterstorm 100%
$8.41#307
"Counter target instant or sorcery spell unless its controller pays {1}."
Molten Influence 88%
$6.18#17395
"Counter target instant or sorcery spell unless its controller has this card deal 4 damage to them."
Quash 86%
$0.09#30614
"Counter target instant or sorcery spell. Search its controller's graveyard, hand, and library for all cards with the same name as that spell and exile them. Then that player shuffles."
Test of Talents 86%
$0.30#18038
"Counter target instant or sorcery spell. Search its controller's graveyard, hand, and library for any number of cards with the same name as that spell and exile them. That player shuffles, then draws a card for each card exiled from their hand this way."
Spellshift 85%
$0.33#26338
"Counter target instant or sorcery spell. Its controller reveals cards from the top of their library until they reveal an instant or sorcery card. That player may cast that card without paying its mana cost. Then the player shuffles."
Swan Song 81%
$9.05#71
"Counter target enchantment, instant, or sorcery spell. Its controller creates a 2/2 blue Bird creature token with flying."