Firemaw Kavu 
Creature — Kavu
$0.11 #25553 0.00 19.9 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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+1 more matching line
Spitebellows92%
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"When this creature leaves the battlefield, it deals 6 damage to target creature."
Inferno Trap92%
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"this card deals 4 damage to target creature."
Iroas's Blessing91%
$0.07↓#225500.006.6 years↓
"When this Aura enters, it deals 4 damage to target creature or planeswalker an opponent controls."
Lightning Axe90%
$0.12↑#6968↑0.17↑19.9 years
"this card deals 5 damage to target creature."
Harvest Pyre90%
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"this card deals X damage to target creature."
Glassworks // Shattered Yard89%
$0.20↑#8782↑0.19↑1.9 years↓
"When you unlock this door, this Room deals 4 damage to target creature an opponent controls."
Cut In88%
$0.08↓#258720.073.0 years↓
"this card deals 4 damage to target creature."
Corrupt Eunuchs88%
$8.54↑#31416↓0.0027.3 years↑
"When this creature enters, it deals 2 damage to target creature."
Fire Imp88%
$0.05↓#305770.26↑29.3 years↑
"When this creature enters, it deals 2 damage to target creature."
Goblin Commando88%
$0.17↑#268210.86↑27.2 years↑
"When this creature enters, it deals 2 damage to target creature."
Flametongue Kavu88%
$0.10↓#12966↑0.25↑25.6 years↑
"When this creature enters, it deals 4 damage to target creature."
Firecannon Blast88%
$0.05↓#229630.47↑8.9 years↓
"this card deals 3 damage to target creature."
Trial of Zeal88%
$0.09↓#287960.53↑9.4 years↓
"When this enchantment enters, it deals 3 damage to any target."
Deem Worthy88%
$0.09↓#216970.60↑9.4 years↓
"this card deals 7 damage to target creature."
+1 more matching line
Skirk Commando88%
$0.06↓#246340.27↑23.9 years↑
"Whenever this creature deals combat damage to a player, you may have it deal 2 damage to target creature that player controls."
First Volley87%
$0.15↑#243900.29↑21.6 years↑
"this card deals 1 damage to target creature and 1 damage to that creature's controller."
Reclusive Artificer87%
$0.10↓#250990.29↑11.1 years↓
"When this creature enters, you may have it deal damage to target creature equal to the number of artifacts you control."