Spell Satchel 
Artifact
Magecraft — Whenever you cast or copy an instant or sorcery spell, put a book counter on this artifact.
{T}, Remove a book counter from this artifact: Add {C}.
{3}, {T}, Remove three book counters from this artifact: Draw a card.
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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.
Diary of Dreams 90%
$0.21#11492
"Whenever you cast an instant or sorcery spell, put a page counter on this artifact."
+1 more matching line
Adaptive Training Post 85%
$0.24#8625
"Whenever you cast an instant or sorcery spell, if this artifact has fewer than three charge counters on it, put a charge counter on it."
+1 more matching line
Primal Amulet // Primal Wellspring 83%
$13.51#2071
"Whenever you cast an instant or sorcery spell, put a charge counter on this artifact. Then if there are four or more charge counters on it, you may remove those counters and transform it."
Geistflame Reservoir 83%
$0.18#16934
"Whenever you cast an instant or sorcery spell, put a charge counter on this artifact."
Jin-Gitaxias, Progress Tyrant 82%
$9.58#1699
"Whenever you cast an artifact, instant, or sorcery spell, copy that spell. You may choose new targets for the copy. This ability triggers only once each turn."
Archmage Emeritus 82%
$0.51#258
"Whenever you cast or copy an instant or sorcery spell, draw a card."
Pyromancer Ascension 82%
$0.28#11771
"Whenever you cast an instant or sorcery spell that has the same name as a card in your graveyard, you may put a quest counter on this enchantment."
Academy Wall 81%
$0.27#13132
"Whenever you cast an instant or sorcery spell, you may draw a card. If you do, discard a card. This ability triggers only once each turn."