Parallax Dementia 

Enchantment — Aura
$0.07 #28390 0.00 26.7 years
Enchant creature
Fading 1 (This enchantment enters with one fade counter on it. At the beginning of your upkeep, remove a fade counter from it. If you can't, sacrifice it.)
Enchanted creature gets +3/+2.
When this Aura leaves the battlefield, destroy enchanted creature. That creature can't be regenerated.
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Cards similar to Parallax Dementia 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.
Phyrexian Bloodstock92%
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"When this creature leaves the battlefield, destroy target white creature. It can't be regenerated."
Seal of Doom82%
$0.14↑#9696↑0.0726.7 years
"Sacrifice this enchantment: Destroy target nonblack creature. It can't be regenerated."
Dark Hatchling82%
$0.13↑#18946↑0.0028.0 years↑
"When this creature enters, destroy target nonblack creature. It can't be regenerated."
Annihilate81%
$0.05↓#20284↑0.0026.0 years
"Destroy target nonblack creature. It can't be regenerated."
Putrefy81%
$0.19↑#345↑0.18↑21.0 years↓
"Destroy target artifact or creature. It can't be regenerated."
Winds of Rath80%
$0.33↑#1692↑0.53↑29.0 years↑
"Destroy all creatures that aren't enchanted. They can't be regenerated."
Plague Wind80%
$2.61↑#6575↑0.56↑26.4 years
"Destroy all creatures you don't control. They can't be regenerated."
Visara the Dreadful80%
$2.93↑#14003↑0.0024.0 years↓
"
: Destroy target creature. It can't be regenerated."
Nekrataal80%
$0.12↑#11489↑0.41↑29.7 years↑
"When this creature enters, destroy target nonartifact, nonblack creature. That creature can't be regenerated."
Damn79%
$1.76↑#348↑0.43↑5.5 years↓
"Destroy target creature. A creature destroyed this way can't be regenerated."
Dark Banishing78%
$0.04↓#20172↑0.12↑31.4 years↑
"Destroy target nonblack creature. It can't be regenerated."