Runechanter's Pike 
Artifact — Equipment
$0.32 #9849 0.31 14.9 years
Equipped creature has first strike and gets +X/+0, where X is the number of instant and sorcery cards in your graveyard.
Equip 
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Cards similar to Runechanter's Pike 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.
Glamdring94%
$3.27↑#5557↑0.363.2 years↓
"Equipped creature has first strike and gets +1/+0 for each instant and sorcery card in your graveyard."
+1 more matching line
Rielle, the Everwise74%
$4.11↑#5905↑0.386.4 years↓
"this card gets +1/+0 for each instant and sorcery card in your graveyard."
Enigma Drake74%
$0.07↓#14192↓0.12↓9.4 years↓
"this card's power is equal to the number of instant and sorcery cards in your graveyard."
Spellheart Chimera74%
$0.14↓#15606↓0.00↓12.9 years↓
"this card's power is equal to the number of instant and sorcery cards in your graveyard."
Invade the City71%
$0.16↓#14148↓0.07↓7.3 years↓
"Amass Zombies X, where X is the number of instant and sorcery cards in your graveyard."
Kinetic Augur71%
$0.23↓#19114↓0.20↓6.2 years↓
"this card's power is equal to the number of instant and sorcery cards in your graveyard."
Serpentine Curve70%
$0.13↓#18066↓0.245.4 years↓
"Create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it, where X is one plus the total number of instant and sorcery cards you own in exile and in your graveyard."
Quick-Draw Katana70%
$0.16↓#84320.08↓1.8 years↓
"During your turn, equipped creature gets +2/+0 and has first strike."
+1 more matching line