Snuff Out 
Instant
$6.28 #710 0.59 26.9 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.
Rouse97%
$0.19↓#26196↓0.18↓26.9 years
"If you control a Swamp, you may pay 2 life rather than pay this spell's mana cost."
Flesh to Dust88%
$0.04↓#25633↓0.06↓12.1 years↓
"Destroy target creature. It can't be regenerated."
Terminate88%
$0.30↓#224↑0.19↓25.6 years↓
"Destroy target creature. It can't be regenerated."
Annihilate86%
$0.06↓#20006↓0.5925.9 years
"Destroy target nonblack creature. It can't be regenerated."
Dark Hatchling84%
$0.12↓#18502↓0.38↓27.9 years
"When this creature enters, destroy target nonblack creature. It can't be regenerated."
Nekrataal84%
$0.12↓#11135↓0.12↓29.6 years↑
"When this creature enters, destroy target nonartifact, nonblack creature. That creature can't be regenerated."
Dark Banishing84%
$0.05↓#19963↓0.6031.3 years↑
"Destroy target nonblack creature. It can't be regenerated."
Seal of Doom84%
$0.12↓#9437↓0.5826.6 years
"Sacrifice this enchantment: Destroy target nonblack creature. It can't be regenerated."
Vendetta84%
$0.21↓#11293↓0.00↓26.9 years
"Destroy target nonblack creature. It can't be regenerated. You lose life equal to that creature's toughness."
Damn82%
$2.03↓#345↑0.36↓5.3 years↓
"Destroy target creature. A creature destroyed this way can't be regenerated."
Putrefy82%
$0.15↓#336↑0.18↓20.9 years↓
"Destroy target artifact or creature. It can't be regenerated."
Spite // Malice82%
$0.06↓#20690↓0.24↓25.9 years
"Destroy target nonblack creature. It can't be regenerated."
Slaughter82%
$4.98↓#14325↓0.5228.2 years↑
"Destroy target nonblack creature. It can't be regenerated."
+1 more matching line
Expunge82%
$0.11↓#20355↓0.07↓27.9 years
"Destroy target nonartifact, nonblack creature. It can't be regenerated."
Fissure82%
$0.11↓#23530↓0.42↓32.1 years↑
"Destroy target creature or land. It can't be regenerated."
Terror81%
$0.08↓#8550↓0.25↓33.1 years↑
"Destroy target nonartifact, nonblack creature. It can't be regenerated."
Feast or Famine80%
$0.10↓#26689↓0.24↓30.2 years↑
"• Destroy target nonartifact, nonblack creature. It can't be regenerated."
Death Bomb80%
$0.14↓#28713↓0.32↓25.6 years↓
"Destroy target nonblack creature. It can't be regenerated. Its controller loses 2 life."
Oxidize80%
$0.14↓#20763↓0.00↓22.6 years↓
"Destroy target artifact. It can't be regenerated."
Devour in Shadow80%
$0.20↓#17880↓0.09↓22.3 years↓
"Destroy target creature. It can't be regenerated. You lose life equal to that creature's toughness."