Glamdring 
Legendary Artifact — Equipment
$3.27 #5557 0.36 3.2 years
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 
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Cards similar to Glamdring 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 Pike94%
$0.32↓#9849↓0.3114.9 years↑
"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
Aisha of Sparks and Smoke84%
$0.62↓#16528↓0.434.5 years↑
"Whenever Aisha deals combat damage, you may cast a sorcery spell from your hand with mana value less than or equal to that damage without paying its mana cost."
Buster Sword81%
$52.70↑#914↑0.96↑1.2 years↓
"Whenever equipped creature deals combat damage to a player, draw a card, then you may cast a spell from your hand with mana value less than or equal to that damage without paying its mana cost."
+2 more matching lines
Tetsuo, Imperial Champion76%
$0.43↓#17394↓0.75↑4.0 years
"• You may cast an instant or sorcery spell from your hand with mana value less than or equal to the greatest mana value among Equipment attached to this card without paying its mana cost."
Zaffai and the Tempests76%
$0.23↓#12693↓0.00↓0.4 years↓
"Once during each of your turns, you may cast an instant or sorcery spell from your hand without paying its mana cost."
Founding the Third Path74%
$0.21↓#13905↓0.384.0 years
"You may cast an instant or sorcery spell with mana value 1 or 2 from your hand without paying its mana cost."
Power Fist74%
$14.86↑#1798↑0.432.5 years
"Equip "
"
Omnispell Adept72%
$0.23↓#19012↓0.417.9 years↑
"
, 
: You may cast an instant or sorcery spell from your hand without paying its mana cost."
, : You may cast an instant or sorcery spell from your hand without paying its mana cost."
Skyway Robber70%
$0.37↓#16654↓0.09↓4.4 years↑
"This creature escapes with "Whenever this creature deals combat damage to a player, you may cast an artifact, instant, or sorcery spell from among cards exiled with this creature without paying its mana cost.""
Efreet Flamepainter70%
$0.33↓#15409↓0.13↓5.4 years↑
"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."
Sram's Expertise70%
$0.77↓#6907↓0.19↓9.6 years↑
"You may cast a spell with mana value 3 or less from your hand without paying its mana cost."
The Reaver Cleaver70%
$20.37↑#541↑0.56↑4.0 years
"Equip "
"