Gathering Stone {4}
Artifact
As this artifact enters, choose a creature type.
Spells you cast of the chosen type cost {1} less to cast.
When this artifact enters and at the beginning of your upkeep, look at the top card of your library. If it's a card of the chosen type, you may reveal it and put it into your hand. If you don't put the card into your hand, you may put it into your graveyard.
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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.
Umori, the Collector 100%
$0.26#11613
"Spells you cast of the chosen type cost {1} less to cast."
+1 more matching line
Cloud Key 100%
$1.94#618
"Spells you cast of the chosen type cost {1} less to cast."
+1 more matching line
Stenn, Paranoid Partisan 100%
$0.34#7579
"Spells you cast of the chosen type cost {1} less to cast."
Norman Osborn // Green Goblin 86%
$18.99#5662
"Spells you cast from your graveyard cost {2} less to cast."
Emet-Selch of the Third Seat 86%
$0.34#3271
"Spells you cast from your graveyard cost {2} less to cast."
Council of the Absolute 85%
$0.31#23991
"Spells with the chosen name you cast cost {2} less to cast."
Locket of Yesterdays 83%
$2.30#7553
"Spells you cast cost {1} less to cast for each card with the same name as that spell in your graveyard."
Cunning Nightbonder 83%
$0.30#10243
"Spells with flash you cast cost {1} less to cast and can't be countered."