Glamdring {2}
Legendary Artifact — Equipment
Equipped creature has first strike and gets +1/+0 for each instant and sorcery card in your graveyard.
Whenever equipped creature deals combat damage to a player, you may cast an instant or sorcery spell from your hand with mana value less than or equal to that damage without paying its mana cost.
Equip {3}
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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.
Runechanter's Pike 88%
$0.31#9831
"Equipped creature has first strike and gets +X/+0, where X is the number of instant and sorcery cards in your graveyard."
+1 more matching line
Efreet Flamepainter 81%
$0.24#15040
"Whenever this creature deals combat damage to a player, you may cast target instant or sorcery card from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Wildfire Eternal 81%
$0.25#16268
"Whenever this creature attacks and isn't blocked, you may cast an instant or sorcery spell from your hand without paying its mana cost."
Deluxe Dragster 81%
$2.19#6906
"Whenever this Vehicle deals combat damage to a player, you may cast target instant or sorcery card from that player's graveyard without paying its mana cost. If that spell would be put into a graveyard, exile it instead."