Serpent Assassin 
Creature — Snake Assassin
$0.31 #22396 0.44 29.3 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%
$0.40↑#1115↑0.27↓8.6 years↓
"When this creature enters, destroy target creature an opponent controls."
Ghostly Visit94%
$2.24↑#30262↓0.67↑27.3 years↓
"Destroy target nonblack creature."
Hand of Death94%
$0.12↓#27057↓0.00↓29.3 years
"Destroy target nonblack creature."
Bone Shredder94%
$0.11↓#9254↑0.06↓27.6 years↓
"When this creature enters, destroy target nonartifact, nonblack creature."
Fell90%
$0.34↑#2798↑0.11↓2.1 years↓
"Destroy target creature."
Murder90%
$0.10↓#840↑0.16↓14.1 years↓
"Destroy target creature."
Bilbo's Deadly Slice90%
$0.12↓#181750.00↓0.1 years↓
"Destroy target creature."
Impale90%
$0.11↓#238170.06↓8.6 years↓
"Destroy target creature."
Eviscerate90%
$0.06↓#230550.31↓8.4 years↓
"Destroy target creature."
Bala Ged Scorpion89%
$0.03↓#29964↓0.27↓16.4 years↓
"When this creature enters, you may destroy target creature with power 1 or less."
Twisted Embrace88%
$0.14↓#15500↑0.22↓4.5 years↓
"When this Aura enters, destroy target creature or planeswalker an opponent controls."
Heartstabber Mosquito88%
$0.05↓#248440.00↓16.9 years↓
"When this creature enters, if it was kicked, destroy target creature."
Dark Offering88%
$0.23↓#31480↓0.00↓28.2 years↓
"Destroy target nonblack creature. You gain 3 life."
Poison Arrow88%
$42.60↑#31479↓0.00↓27.3 years↓
"Destroy target nonblack creature. You gain 3 life."
Chill to the Bone88%
$0.13↓#216570.5320.1 years↓
"Destroy target nonsnow creature."
Dakmor Lancer88%
$0.19↓#28361↓0.21↓27.2 years↓
"When this creature enters, destroy target nonblack creature."
Defenestrate88%
$0.06↓#182970.54↑4.9 years↓
"Destroy target creature without flying."
Dragon's Prey87%
$0.12↓#16531↑0.12↓1.4 years↓
"Destroy target creature."
Dalek Drone86%
$0.39↑#7557↑0.482.9 years↓
"When this creature enters, destroy target creature an opponent controls. That player loses 3 life."
Violet Pall86%
$0.19↓#218040.27↓18.6 years↓
"Destroy target nonblack creature. Create a 1/1 black Faerie Rogue creature token with flying."