Serpent Assassin 
Creature — Snake Assassin
$0.26 #22541 0.33 29.5 years
When this creature enters, you may destroy target nonblack creature.
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Cards similar to Serpent Assassin 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.
Ravenous Chupacabra96%
$0.50↑#1149↑0.23↓8.8 years↓
"When this creature enters, destroy target creature an opponent controls."
Hand of Death94%
$0.12↓#27401↓0.00↓29.5 years
"Destroy target nonblack creature."
Ghostly Visit94%
$2.14↑#30505↓0.00↓27.5 years↓
"Destroy target nonblack creature."
Bone Shredder94%
$0.12↓#9460↑0.12↓27.7 years↓
"When this creature enters, destroy target nonartifact, nonblack creature."
Murder90%
$0.10↓#880↑0.12↓14.3 years↓
"Destroy target creature."
Impale90%
$0.12↓#241360.15↓8.8 years↓
"Destroy target creature."
Eviscerate90%
$0.05↓#233860.00↓8.5 years↓
"Destroy target creature."
Bilbo's Deadly Slice90%
$0.13↓#14536↑0.17↓0.2 years↓
"Destroy target creature."
Fell90%
$0.36↑#2961↑0.16↓2.2 years↓
"Destroy target creature."
Bala Ged Scorpion89%
$0.03↓#30298↓0.11↓16.5 years↓
"When this creature enters, you may destroy target creature with power 1 or less."
Twisted Embrace88%
$0.17↓#15946↑0.00↓4.7 years↓
"When this Aura enters, destroy target creature or planeswalker an opponent controls."
Poison Arrow88%
$47.36↑#31741↓0.12↓27.5 years↓
"Destroy target nonblack creature. You gain 3 life."
Dark Offering88%
$0.23↓#31811↓0.04↓28.3 years↓
"Destroy target nonblack creature. You gain 3 life."
Chill to the Bone88%
$0.13↓#219500.2520.2 years↓
"Destroy target nonsnow creature."
Dakmor Lancer88%
$0.18↓#28732↓0.11↓27.3 years↓
"When this creature enters, destroy target nonblack creature."
Defenestrate88%
$0.07↓#185730.12↓5.1 years↓
"Destroy target creature without flying."
Dragon's Prey86%
$0.11↓#16611↑0.00↓1.5 years↓
"Destroy target creature."
Dalek Drone86%
$0.35↑#7767↑0.20↓3.0 years↓
"When this creature enters, destroy target creature an opponent controls. That player loses 3 life."
Violet Pall86%
$0.20↓#220860.06↓18.7 years↓
"Destroy target nonblack creature. Create a 1/1 black Faerie Rogue creature token with flying."
Stream of Acid86%
$1.58↑#30476↓0.55↑27.3 years↓
"Destroy target land or nonblack creature."