Tooth Collector 
Creature — Human Rogue
$0.05 #25910 0.18 10.6 years
When this creature enters, target creature an opponent controls gets -1/-1 until end of turn.
Delirium — At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, target creature that player controls gets -1/-1 until end of turn.
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Cards similar to Tooth Collector 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.
Weed-Pruner Poplar86%
$0.14↑#267500.1218.7 years↑
"At the beginning of your upkeep, target creature other than this creature gets -1/-1 until end of turn."
Deluge of Doom86%
$0.24↑#10687↑0.132.1 years↓
"All creatures get -X/-X until end of turn, where X is the number of card types among cards in your graveyard."
Eyeblight Assassin86%
$0.09↑#222390.06↓11.3 years
"When this creature enters, target creature an opponent controls gets -1/-1 until end of turn."
Blister Beetle85%
$0.04↓#250260.43↑18.0 years↑
"When this creature enters, target creature gets -1/-1 until end of turn."
Farbog Boneflinger85%
$0.08↑#309450.1814.7 years↑
"When this creature enters, target creature gets -2/-2 until end of turn."
Fourth Bridge Prowler84%
$0.22↑#15029↑0.06↓9.7 years
"When this creature enters, you may have target creature get -1/-1 until end of turn."
Keening Banshee84%
$0.12↑#276740.1321.2 years↑
"When this creature enters, target creature gets -2/-2 until end of turn."
Skulking Killer84%
$0.03↓#256200.06↓4.9 years↓
"When this creature enters, target creature an opponent controls gets -2/-2 until end of turn if that opponent controls no other creatures."
Ambush Gigapede82%
$0.15↑#207350.06↓2.5 years↓
"When this creature enters, target creature an opponent controls gets -2/-2 until end of turn."
Topplegeist82%
$0.22↑#9751↑0.1410.6 years
"At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, tap target creature that player controls."
Grandmother Sengir80%
$1.16↑#296980.00↓31.1 years↑
"
, 
: Target creature gets -1/-1 until end of turn."
, : Target creature gets -1/-1 until end of turn."
Pull Under80%
$0.09↑#304290.1222.1 years↑
"Target creature gets -5/-5 until end of turn."
Demon's Grasp80%
$0.13↑#274280.00↓11.0 years
"Target creature gets -5/-5 until end of turn."
Throttle80%
$0.05#289820.32↑12.1 years↑
"Target creature gets -4/-4 until end of turn."
Dark Deed80%
$0.21↑#16828↑0.130.3 years↓
"Target creature gets -4/-4 until end of turn."
Grasp of Darkness80%
$0.09↑#11722↑0.2416.1 years↑
"Target creature gets -4/-4 until end of turn."
Lash of the Whip80%
$0.03↓#290730.06↓13.1 years↑
"Target creature gets -4/-4 until end of turn."
Flatten80%
$0.05#287400.00↓11.6 years
"Target creature gets -4/-4 until end of turn."
Eyes of the Beholder79%
$0.18↑#216720.06↓5.2 years↓
"Target creature gets -11/-11 until end of turn."
Orc Sureshot79%
$0.20↑#16717↑0.07↓11.7 years↑
"Whenever another creature you control enters, target creature an opponent controls gets -1/-1 until end of turn."