Harnesser of Storms 

Creature — Otter Wizard
$0.22 #8368 0.14 2.2 years
Whenever you cast a noncreature or Otter spell, you may exile the top card of your library. Until end of turn, you may play that card. This ability triggers only once each turn.
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Cards similar to Harnesser of Storms 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.
Wiccan, Young Avenger86%
$0.26↑#18645↓0.35↑0.3 years↓
"Whenever you cast a noncreature spell, exile the top card of your library. Until your next end step, you may play that card."
Count on Luck74%
$0.28↑#4106↑0.111.7 years
"At the beginning of your upkeep, exile the top card of your library. You may play that card this turn."
Cleon, Merry Champion74%
$0.31↑#18628↓0.31↑1.9 years
"Whenever you cast a spell that targets this card, exile the top card of your library. You may play that card until the end of your next turn."
Superior Foes of Spider-Man74%
$0.15↓#15200↓0.50↑1.1 years↓
"Whenever you cast a spell with mana value 4 or greater, you may exile the top card of your library. If you do, you may play that card until you exile another card with this creature."