Rakdos Headliner 
Creature — Devil
$0.09 #23186 0.06 5.3 years
Haste
Echo—Discard a card. (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
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Cards similar to Rakdos Headliner 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.
Deepcavern Imp100%
$0.03↓#28870↓0.0719.5 years↑
"Echo—Discard a card."
Skizzik Surger97%
$0.17↑#31987↓0.0019.5 years↑
"Haste"
Shah of Naar Isle82%
$0.41↑#237290.0019.5 years↑
"Echo 
"
"
Uktabi Drake80%
$0.06↓#267750.0019.7 years↑
"Echo 
"
"
Halam Djinn80%
$0.15↑#32200↓0.0026.0 years↑
"Haste"
Iron-Barb Hellion80%
$0.06↓#31554↓0.0022.4 years↑
"Haste"
Henchfiend of Ukor79%
$0.07↓#32095↓0.0619.5 years↑
"Echo "
"+1 more matching line
Orcish Hellraiser78%
$0.12↑#277510.17↑7.4 years↑
"Echo "
"
Hammerheim Deadeye78%
$0.06↓#30751↓0.0719.7 years↑
"Echo 
"
"
Rotting Regisaur77%
$2.08↑#5066↑0.27↑7.3 years↑
"At the beginning of your upkeep, discard a card."
Timbermare76%
$0.34↑#253740.1319.7 years↑
"Echo "
"+1 more matching line
Bloodrage Brawler76%
$0.21↑#196750.009.5 years↑
"When this creature enters, discard a card."
Stingscourger72%
$0.06↓#16095↑0.0019.7 years↑
"Echo 
"
"