Mindbreak Trap 
Instant — Trap
$6.91 #553 0.95 17.0 years
If an opponent cast three or more spells this turn, you may pay 
rather than pay this spell's mana cost.
rather than pay this spell's mana cost.Exile any number of target spells.
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Cards similar to Mindbreak Trap 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.
Ravenous Trap73%
$0.35↓#19673↓0.53↓17.0 years
"If an opponent had three or more cards put into their graveyard from anywhere this turn, you may pay rather than pay this spell's mana cost."
rather than pay this spell's mana cost."
Archive Trap72%
$1.07↓#5855↓0.56↓17.0 years
"If an opponent searched their library this turn, you may pay rather than pay this spell's mana cost."
rather than pay this spell's mana cost."
Once Upon a Time70%
$0.55↓#8856↓0.00↓7.0 years↓
"If this spell is the first spell you've cast this game, you may cast it without paying its mana cost."