Jace's Phantasm 
Creature — Illusion
$0.26 #8019 0.00 14.3 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%
$0.14↓#88280.10↑6.1 years↓
"This creature gets +3/+0 as long as an opponent has eight or more cards in their graveyard."
Tenured Oilcaster84%
$0.11↓#23908↓0.003.5 years↓
"This creature gets +3/+0 as long as an opponent has eight or more cards in their graveyard."
Nimana Skitter-Sneak82%
$0.08↓#29862↓0.20↑6.1 years↓
"As long as an opponent has eight or more cards in their graveyard, this creature gets +1/+0 and has menace."
Into the Story81%
$0.23↓#5596↑0.007.0 years↓
"This spell costs
less to cast if an opponent has seven or more cards in their graveyard."
Gorilla Titan78%
$0.33↑#22008↓0.0725.1 years↑
"This creature gets +4/+4 as long as there are no cards in your graveyard."
Syndicate Infiltrator78%
$0.14↓#27555↓0.004.5 years↓
"As long as there are five or more mana values among cards in your graveyard, this creature gets +2/+2."
Swimmer in Nightmares76%
$0.22↓#28966↓0.066.7 years↓
"This creature gets +3/+0 as long as there are ten or more cards in a single graveyard."