Jace's Phantasm 
Creature — Illusion
$0.28 #7830 0.06 14.1 years
Flying
This creature gets +4/+4 as long as an opponent has ten or more cards in their graveyard.
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Cards similar to Jace's Phantasm 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.
Blackbloom Rogue // Blackbloom Bog92%
$0.10↓#87140.085.9 years↓
"This creature gets +3/+0 as long as an opponent has eight or more cards in their graveyard."
Tenured Oilcaster84%
$0.13↓#23423↓0.60↑3.4 years↓
"This creature gets +3/+0 as long as an opponent has eight or more cards in their graveyard."
Into the Story81%
$0.22↓#5580↑0.066.9 years↓
"This spell costs
less to cast if an opponent has seven or more cards in their graveyard."
Nimana Skitter-Sneak80%
$0.07↓#29516↓0.005.9 years↓
"As long as an opponent has eight or more cards in their graveyard, this creature gets +1/+0 and has menace."
Gorilla Titan78%
$0.36↑#21616↓0.50↑24.9 years↑
"This creature gets +4/+4 as long as there are no cards in your graveyard."
Syndicate Infiltrator78%
$0.11↓#27274↓0.25↑4.4 years↓
"As long as there are five or more mana values among cards in your graveyard, this creature gets +2/+2."
+1 more matching line