Catalyst Stone 
Artifact
$8.52 #13024 0.36 25.1 years
Flashback costs you pay cost less.
less.Flashback costs your opponents pay cost more.
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Cards similar to Catalyst Stone 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.
Grand Arbiter Augustin IV76%
$18.23↑#1808↑2.76↑20.5 years↓
"Spells your opponents cast cost 
more to cast."
more to cast."+1 more matching line
Hinata, Dawn-Crowned73%
$0.35↓#9967↑0.93↑4.7 years↓
"Spells your opponents cast cost more to cast for each target."
more to cast for each target."
Elderwood Scion72%
$0.27↓#23834↓0.00↓14.4 years↓
"Spells your opponents cast that target this creature cost more to cast."
more to cast."+1 more matching line
God-Pharaoh's Statue72%
$0.66↓#2451↑1.60↑7.5 years↓
"Spells your opponents cast cost more to cast."
more to cast."