Starnheim Courser 

Creature — Pegasus
Flying
Artifact and enchantment 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.
Aura of Silence 90%
$8.19#2154
"Artifact and enchantment spells your opponents cast cost {2} more to cast."
Assassin's Ink 88%
$0.25#15287
"This spell costs {1} less to cast if you control an artifact and {1} less to cast if you control an enchantment."
Artificer Class 81%
$15.06#4038
"The first artifact spell you cast each turn costs {1} less to cast."
Stoic Rebuttal 81%
$0.30#6572
"This spell costs {1} less to cast if you control three or more artifacts."