Snuff Out 
Instant
$5.55 #684 0.56 27.0 years
If you control a Swamp, you may pay 4 life rather than pay this spell's mana cost.
Destroy target nonblack creature. It can't be regenerated.
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Cards similar to Snuff Out 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.
Rouse98%
$0.11↓#26435↓0.23↓27.0 years
"If you control a Swamp, you may pay 2 life rather than pay this spell's mana cost."
Terminate86%
$0.27↓#227↑0.20↓25.7 years↓
"Destroy target creature. It can't be regenerated."
Flesh to Dust86%
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"Destroy target creature. It can't be regenerated."
Annihilate86%
$0.05↓#20284↓0.00↓26.0 years
"Destroy target nonblack creature. It can't be regenerated."
Damn84%
$1.76↓#348↑0.43↓5.5 years↓
"Destroy target creature. A creature destroyed this way can't be regenerated."
Dark Hatchling84%
$0.13↓#18946↓0.00↓28.0 years
"When this creature enters, destroy target nonblack creature. It can't be regenerated."
Nekrataal84%
$0.12↓#11489↓0.41↓29.7 years↑
"When this creature enters, destroy target nonartifact, nonblack creature. That creature can't be regenerated."
Dark Banishing83%
$0.04↓#20172↓0.12↓31.4 years↑
"Destroy target nonblack creature. It can't be regenerated."
Seal of Doom83%
$0.14↓#9696↓0.07↓26.7 years
"Sacrifice this enchantment: Destroy target nonblack creature. It can't be regenerated."
Vendetta83%
$0.24↓#11454↓0.26↓27.0 years
"Destroy target nonblack creature. It can't be regenerated. You lose life equal to that creature's toughness."
Spite // Malice82%
$0.06↓#21175↓0.05↓26.0 years
"Destroy target nonblack creature. It can't be regenerated."
Putrefy82%
$0.19↓#345↑0.18↓21.0 years↓
"Destroy target artifact or creature. It can't be regenerated."
Slaughter81%
$3.62↓#14418↓0.13↓28.3 years↑
"Destroy target nonblack creature. It can't be regenerated."
+1 more matching line
Expunge81%
$0.12↓#20782↓0.13↓28.0 years
"Destroy target nonartifact, nonblack creature. It can't be regenerated."
Fissure81%
$0.12↓#23671↓0.4732.2 years↑
"Destroy target creature or land. It can't be regenerated."
Terror80%
$0.11↓#8715↓0.14↓33.2 years↑
"Destroy target nonartifact, nonblack creature. It can't be regenerated."
Feast or Famine80%
$0.10↓#26913↓0.07↓30.4 years↑
"• Destroy target nonartifact, nonblack creature. It can't be regenerated."
Devour in Shadow80%
$0.20↓#18322↓0.06↓22.4 years↓
"Destroy target creature. It can't be regenerated. You lose life equal to that creature's toughness."
Befoul80%
$0.10↓#23012↓0.21↓28.0 years
"Destroy target land or nonblack creature. It can't be regenerated."
Oxidize80%
$0.15↓#21044↓0.06↓22.7 years↓
"Destroy target artifact. It can't be regenerated."