Plague Fiend 
Creature — Insect
$0.17 #26210 0.12 26.4 years
Whenever this creature deals combat damage to a creature, destroy that creature unless its controller pays 
.
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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.
Voracious Cobra90%
$0.26↑#276050.1926.0 years
"Whenever this creature deals combat damage to a creature, destroy that creature."
Lowland Basilisk83%
$0.12↓#311840.1428.6 years↑
"Whenever this creature deals damage to a creature, destroy that creature at end of combat."
Stinkweed Imp82%
$1.13↑#3158↑0.25↑21.0 years↓
"Whenever this creature deals combat damage to a creature, destroy that creature."
Creepy Doll81%
$0.75↑#9007↑0.40↑15.1 years↓
"Whenever this creature deals combat damage to a creature, flip a coin. If you win the flip, destroy that creature."
Ohran Viper80%
$1.31↑#7843↑0.56↑20.2 years↓
"Whenever this creature deals combat damage to a creature, destroy that creature at end of combat."
Venomous Fangs80%
$0.14↓#251160.27↑28.0 years↑
"Whenever enchanted creature deals damage to a creature, destroy the other creature."
Death Charmer80%
$0.09↓#291430.00↓26.4 years
"Whenever this creature deals combat damage to a creature, that creature's controller loses 2 life unless they pay ."
."
Serpentine Basilisk80%
$0.15↓#274780.33↑24.0 years↓
"Whenever this creature deals combat damage to a creature, destroy that creature at end of combat."
Dripping Dead80%
$0.15↓#309610.00↓23.7 years↓
"Whenever this creature deals combat damage to a creature, destroy that creature. It can't be regenerated."
Stone-Tongue Basilisk76%
$0.36↑#265810.0725.1 years↓
"Whenever this creature deals combat damage to a creature, destroy that creature at end of combat."
Soul Charmer75%
$0.12↓#300630.0726.4 years
"Whenever this creature deals combat damage to a creature, you gain 2 life unless that creature's controller pays ."
."
Mephitic Ooze74%
$0.43↑#251450.0622.7 years↓
"Whenever this creature deals combat damage to a creature, destroy that creature. The creature can't be regenerated."
Green Dragon74%
$0.25↑#14109↑0.44↑5.2 years↓
"When this creature enters, until end of turn, whenever a creature an opponent controls is dealt damage, destroy it."
Simic Basilisk70%
$0.14↓#271970.1120.5 years↓
"
: Until end of turn, target creature with a +1/+1 counter on it gains "Whenever this creature deals combat damage to a creature, destroy that creature at end of combat.""
: Until end of turn, target creature with a +1/+1 counter on it gains "Whenever this creature deals combat damage to a creature, destroy that creature at end of combat.""
Death Pits of Rath70%
$0.86↑#19399↑0.88↑29.0 years↑
"Whenever a creature is dealt damage, destroy it. It can't be regenerated."