Stone Calendar {5}
Artifact
Spells you cast cost {1} less to cast.
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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.
Norman Osborn // Green Goblin 90%
$18.99#5662
"Spells you cast from your graveyard cost {2} less to cast."
Emet-Selch of the Third Seat 90%
$0.34#3271
"Spells you cast from your graveyard cost {2} less to cast."
Council of the Absolute 90%
$0.31#23991
"Spells with the chosen name you cast cost {2} less to cast."
Cunning Nightbonder 88%
$0.30#10243
"Spells with flash you cast cost {1} less to cast and can't be countered."
Locket of Yesterdays 87%
$2.30#7553
"Spells you cast cost {1} less to cast for each card with the same name as that spell in your graveyard."