Geth's Grimoire 
Artifact — Book
Whenever an opponent discards a card, you may draw 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.
Notion Thief 88%
$1.27#1174
"If an opponent would draw a card except the first one they draw in each of their draw steps, instead that player skips that draw and you draw a card."
Alms Collector 81%
$0.96#4105
"If an opponent would draw two or more cards, instead you and that player each draw a card."
Tamiyo, Collector of Tales 81%
$0.25#8229
"Spells and abilities your opponents control can't cause you to discard cards or sacrifice permanents."