Serpent of the Pass {5}{U}{U}
Creature — Serpent
If there are three or more Lesson cards in your graveyard, you may cast this spell as though it had flash.
This spell costs {1} less to cast for each noncreature, nonland card 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.
Emrakul, the Promised End 84%
$20.28#1854
"This spell costs {1} less to cast for each card type among cards in your graveyard."
Gran-Gran 82%
$0.27#6983
"Noncreature spells you cast cost {1} less to cast as long as there are three or more Lesson cards in your graveyard."
Locket of Yesterdays 81%
$2.30#7553
"Spells you cast cost {1} less to cast for each card with the same name as that spell in your graveyard."
Macabre Reconstruction 81%
$0.10#14990
"This spell costs {2} less to cast if a creature card was put into your graveyard from anywhere this turn."
Rona, Sheoldred's Faithful 80%
$0.10#13094
"You may cast this card from your graveyard by discarding two cards in addition to paying its other costs."
Me, the Immortal 80%
$0.30#15041
"You may cast this card from your graveyard by discarding two cards in addition to paying its other costs."
Haakon, Stromgald Scourge 80%
$0.83#6744
"You may cast this card from your graveyard, but not from anywhere else."
Dragon Man, Reformed Robot 80%
$0.19#26598
"You may cast this card from your graveyard by discarding a card in addition to paying its other costs."