Death-Rattle Oni 
Creature — Demon Spirit
$0.15 #17588 0.07 3.3 years
Flash
This spell costs 
less to cast for each creature that died this turn.
less to cast for each creature that died this turn.When this creature enters, destroy all other creatures that were dealt damage this turn.
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Cards similar to Death-Rattle Oni 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.
Lurking Deadeye89%
$0.12↓#23718↓0.29↑6.4 years↑
"When this creature enters, destroy target creature that was dealt damage this turn."
+1 more matching line
Final-Sting Faerie88%
$0.17↑#25052↓0.21↑18.6 years↑
"When this creature enters, destroy target creature that was dealt damage this turn."
Fathom Fleet Cutthroat88%
$0.04↓#25716↓0.008.9 years↑
"When this creature enters, destroy target creature an opponent controls that was dealt damage this turn."
Stingblade Assassin88%
$0.22↑#148090.25↑3.0 years
"When this creature enters, destroy target creature an opponent controls that was dealt damage this turn."
Diregraf Rebirth87%
$0.22↑#12825↑0.29↑4.9 years↑
"This spell costs 
less to cast for each creature that died this turn."
less to cast for each creature that died this turn."
Bone Picker87%
$0.11↓#180640.009.4 years↑
"This spell costs 
less to cast if a creature died this turn."
less to cast if a creature died this turn."
Dreaded Bat-Cloud87%
$0.22↑#22776↓0.000.1 years↓
"This spell costs less to cast if a creature died this turn."
less to cast if a creature died this turn."
Swift Demise87%
$0.33↑#11023↑0.000.5 years↓
"this card deals 1 damage to target creature. Then destroy each creature you don't control that was dealt damage this turn."
Rooftop Assassin86%
$0.13↓#12628↑0.29↑2.4 years
"When this creature enters, destroy target creature an opponent controls that was dealt damage this turn."
+1 more matching line
Vraska's Finisher85%
$0.11↓#21504↓0.19↑7.3 years↑
"When this creature enters, destroy target creature or planeswalker an opponent controls that was dealt damage this turn."
Blood for the Blood God!82%
$9.01↑#3421↑0.36↑3.9 years
"This spell costs less to cast for each creature that died this turn."
less to cast for each creature that died this turn."
Manticore82%
$0.09↓#25568↓0.64↑5.1 years↑
"When this creature enters, destroy target creature an opponent controls that was dealt damage this turn."
+1 more matching line
Mirrodin Avenged82%
$0.13↓#10305↑0.18↑3.4 years
"Destroy target creature that was dealt damage this turn."
Hooded Assassin82%
$0.11↓#22124↓0.0911.6 years↑
"• Destroy target creature that was dealt damage this turn."
Jarl of the Forsaken81%
$0.15#21890↓0.38↑5.6 years↑
"When this creature enters, destroy target creature or planeswalker an opponent controls that was dealt damage this turn."
Covert Cutpurse // Covetous Geist80%
$0.07↓#26560↓0.25↑4.9 years↑
"When this creature enters, destroy target creature you don't control that was dealt damage this turn."
Orzhov Euthanist80%
$0.15#26154↓0.64↑20.6 years↑
"When this creature enters or the creature it haunts dies, destroy target creature that was dealt damage this turn."
Ogre Siegebreaker80%
$0.08↓#29304↓0.25↑7.2 years↑
"
: Destroy target creature that was dealt damage this turn."
: Destroy target creature that was dealt damage this turn."
You Are Already Dead79%
$0.13↓#7125↑0.42↑4.5 years↑
"Destroy target creature that was dealt damage this turn."
Qutrub Forayer79%
$0.09↓#181630.27↑1.2 years↓
"• Destroy target creature that was dealt damage this turn."