Firemaw Kavu 
Creature — Kavu
$0.11 #25907 0.06 20.0 years
Echo (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.)
(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.)When this creature enters, it deals 2 damage to target creature.
When this creature leaves the battlefield, it deals 4 damage to target creature.
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Cards similar to Firemaw Kavu 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.
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"When this creature leaves the battlefield, it deals 6 damage to target creature."
Inferno Trap90%
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"this card deals 4 damage to target creature."
Glassworks // Shattered Yard88%
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"When this creature enters, it deals 2 damage to target creature."
Fire Imp88%
$0.05↓#308920.0529.5 years↑
"When this creature enters, it deals 2 damage to target creature."
Flametongue Kavu88%
$0.08↓#13229↑0.0025.7 years↑
"When this creature enters, it deals 4 damage to target creature."
Trial of Zeal88%
$0.11#290370.009.5 years↓
"When this enchantment enters, it deals 3 damage to any target."
Firecannon Blast88%
$0.05↓#232470.009.1 years↓
"this card deals 3 damage to target creature."
Deem Worthy88%
$0.11#220310.009.5 years↓
"this card deals 7 damage to target creature."
+1 more matching line
Lightning Axe87%
$0.12↑#7058↑0.1420.0 years
"this card deals 5 damage to target creature."
Harvest Pyre87%
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"this card deals X damage to target creature."
First Volley87%
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"this card deals 1 damage to target creature and 1 damage to that creature's controller."
Skirk Commando87%
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"Whenever this creature deals combat damage to a player, you may have it deal 2 damage to target creature that player controls."
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"this card deals 4 damage to target creature you don't control and 2 damage to target creature you control."
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"this card deals 4 damage to target creature."