Locket of Yesterdays 
Artifact
Spells you cast cost {1} less to cast for each card with the same name as that spell in 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.
Heliod, the Radiant Dawn // Heliod, the Warped Eclipse 87%
$2.56#3209
"Spells you cast cost {1} less to cast for each card your opponents have drawn this turn."
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."
Cunning Nightbonder 84%
$0.30#10243
"Spells with flash you cast cost {1} less to cast and can't be countered."
Cemetery Prowler 84%
$4.45#5943
"Spells you cast cost {1} less to cast for each card type they share with cards exiled with this creature."
Naiad of Hidden Coves 83%
$0.14#10160
"During turns other than yours, spells you cast cost {1} less to cast."