Riddlesmith 

Creature — Human Artificer
Whenever you cast an artifact spell, you may draw a card. If you do, discard 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.
Wedding Ring 86%
$11.48#2007
"Whenever an opponent who controls an artifact named this card draws a card during their turn, you draw a card."
Izzet Keyrune 85%
$0.23#15056
"Whenever this artifact deals combat damage to a player, you may draw a card. If you do, discard a card."
Research Thief 82%
$1.58#4580
"Whenever an artifact creature you control deals combat damage to a player, draw a card."
Thopter Spy Network 81%
$0.38#920
"Whenever one or more artifact creatures you control deal combat damage to a player, draw a card."