Dismal Failure 


Instant
Counter target spell. Its controller discards a card.
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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.
Arcane Denial 99%
$1.56#55
"Counter target spell. Its controller may draw up to two cards at the beginning of the next turn's upkeep."
Electrosiphon 99%
$0.38#5501
"Counter target spell. You get an amount of {E} equal to its mana value."
Spell Swindle 99%
$2.16#3050
"Counter target spell. Create X Treasure tokens, where X is that spell's mana value."
Discombobulate 99%
$0.11#21637
"Counter target spell. Look at the top four cards of your library, then put them back in any order."
Reject Imperfection 99%
$0.30#4636
"Counter target spell. If that spell's mana value was 3 or less, proliferate."
Counterlash 98%
$0.32#16460
"Counter target spell. You may cast a spell that shares a card type with it from your hand without paying its mana cost."