Voracious Cobra 
Creature — Snake
$0.27 #27160 0.12 25.9 years
First strike
Whenever this creature deals combat damage to a creature, destroy that creature.
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Cards similar to Voracious Cobra 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.
Creepy Doll94%
$0.90↑#8956↑0.38↑14.9 years↓
"Whenever this creature deals combat damage to a creature, flip a coin. If you win the flip, destroy that creature."
Ohran Viper93%
$1.35↑#7747↑0.1920.1 years↓
"Whenever this creature deals combat damage to a creature, destroy that creature at end of combat."
Serpentine Basilisk93%
$0.17↓#268800.0523.9 years↓
"Whenever this creature deals combat damage to a creature, destroy that creature at end of combat."
Stinkweed Imp92%
$1.12↑#3104↑0.45↑20.9 years↓
"Whenever this creature deals combat damage to a creature, destroy that creature."
Lowland Basilisk92%
$0.13↓#309180.00↓28.5 years↑
"Whenever this creature deals damage to a creature, destroy that creature at end of combat."
Plague Fiend90%
$0.18↓#258740.57↑26.3 years
"Whenever this creature deals combat damage to a creature, destroy that creature unless its controller pays ."
."
Stone-Tongue Basilisk89%
$0.40↑#261570.33↑25.0 years
"Whenever this creature deals combat damage to a creature, destroy that creature at end of combat."
Dripping Dead87%
$0.16↓#306300.33↑23.6 years↓
"Whenever this creature deals combat damage to a creature, destroy that creature. It can't be regenerated."
Venomous Fangs87%
$0.12↓#247660.25↑27.9 years↑
"Whenever enchanted creature deals damage to a creature, destroy the other creature."
Mephitic Ooze86%
$0.62↑#249790.26↑22.6 years↓
"Whenever this creature deals combat damage to a creature, destroy that creature. The creature can't be regenerated."
Green Dragon84%
$0.21↓#13907↑0.35↑5.1 years↓
"When this creature enters, until end of turn, whenever a creature an opponent controls is dealt damage, destroy it."
Death Pits of Rath82%
$0.91↑#19052↑0.43↑28.9 years↑
"Whenever a creature is dealt damage, destroy it. It can't be regenerated."
Cruel Deceiver80%
$0.07↓#274170.1521.9 years↓
": Reveal the top card of your library. If it's a land card, this creature gains "Whenever this creature deals damage to a creature, destroy that creature" until end of turn. Activate only once each turn."
: Reveal the top card of your library. If it's a land card, this creature gains "Whenever this creature deals damage to a creature, destroy that creature" until end of turn. Activate only once each turn."
Shriveling Rot79%
$0.46↑#218290.44↑22.6 years↓
"• Until end of turn, whenever a creature is dealt damage, destroy it."
Simic Basilisk78%
$0.15↓#269950.44↑20.3 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.""
Phage the Untouchable78%
$11.43↑#7465↑0.83↑23.6 years↓
"Whenever Phage deals combat damage to a creature, destroy that creature. It can't be regenerated."
Toxin Sliver77%
$1.86↑#11855↑0.35↑23.6 years↓
"Whenever a Sliver deals combat damage to a creature, destroy that creature. It can't be regenerated."
Sosuke, Son of Seshiro76%
$0.22↓#16725↑0.33↑21.9 years↓
"Whenever a Warrior you control deals combat damage to a creature, destroy that creature at end of combat."
Acidic Dagger74%
$0.64↑#294940.1829.9 years↑
"
, 
: Whenever target creature deals combat damage to a non-Wall creature this turn, destroy that non-Wall creature. When the targeted creature leaves the battlefield this turn, sacrifice this artifact. Activate only before blockers are declared."
, : Whenever target creature deals combat damage to a non-Wall creature this turn, destroy that non-Wall creature. When the targeted creature leaves the battlefield this turn, sacrifice this artifact. Activate only before blockers are declared."
Grotesque Hybrid73%
$0.20↓#283510.75↑24.6 years↓
"Whenever this creature deals combat damage to a creature, destroy that creature. It can't be regenerated."