Horn of Plenty {6}
Artifact
Whenever a player casts a spell, they may pay {1}. If the player does, they draw a card at the beginning of the next end step.
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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.
Unifying Theory 94%
$0.45#24785
"Whenever a player casts a spell, that player may pay {2}. If the player does, they draw a card."
Damping Sphere 81%
$0.89#4999
"Each spell a player casts costs {1} more to cast for each other spell that player has cast this turn."
Weftwalking 80%
$0.35#14864
"The first spell each player casts during each of their turns may be cast without paying its mana cost."