Deepcavern Imp 
Creature — Imp Rebel
$0.03 #28870 0.07 19.5 years
Flying, 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 Deepcavern Imp 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.
Rakdos Headliner100%
$0.09↑#231860.065.3 years↓
"Echo—Discard a card."
Shah of Naar Isle82%
$0.41↑#237290.0019.5 years
"Echo 
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"
Uktabi Drake80%
$0.06↑#267750.0019.7 years
"Echo 
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"+1 more matching line
Henchfiend of Ukor79%
$0.07↑#320950.0619.5 years
"Echo "
"
Orcish Hellraiser78%
$0.12↑#277510.17↑7.4 years↓
"Echo 
"
"
Hammerheim Deadeye77%
$0.06↑#307510.0719.7 years
"Echo 
"
"
Rotting Regisaur76%
$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 "
"
Bloodrage Brawler75%
$0.21↑#19675↑0.009.5 years↓
"When this creature enters, discard a card."
Crazed Skirge72%
$0.29↑#315390.0028.0 years↑
"Flying, haste"
Brimstone Dragon72%
$0.38↑#273790.0028.3 years↑
"Flying, haste"
Snare Thopter72%
$0.04↑#22392↑0.0010.1 years↓
"Flying, haste"
Volcanic Dragon72%
$0.15↑#19241↑0.24↑30.0 years↑
"Flying, haste"
Rorix Bladewing72%
$0.23↑#19175↑0.33↑24.0 years↑
"Flying, haste"
Skyknight Legionnaire72%
$0.07↑#16263↑0.0021.8 years↑
"Flying, haste"
Stingscourger72%
$0.06↑#16095↑0.0019.7 years
"Echo 
"
"
Goldnight Castigator71%
$0.52↑#12305↑0.62↑10.5 years↓
"Flying, haste"
Avatar of Discord70%
$0.28↑#253460.0020.5 years↑
"When this creature enters, sacrifice it unless you discard two cards."