Tooth Collector 
Creature — Human Rogue
$0.05 #25459 0.47 10.5 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%
$0.15↑#262740.29↓18.6 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↑#10104↑0.13↓1.9 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%
$0.07↑#218880.31↓11.1 years
"When this creature enters, target creature an opponent controls gets -1/-1 until end of turn."
Blister Beetle85%
$0.05#246290.29↓17.9 years↑
"When this creature enters, target creature gets -1/-1 until end of turn."
Farbog Boneflinger85%
$0.06↑#30716↓0.29↓14.6 years↑
"When this creature enters, target creature gets -2/-2 until end of turn."
Fourth Bridge Prowler84%
$0.21↑#14512↑0.00↓9.6 years
"When this creature enters, you may have target creature get -1/-1 until end of turn."
Keening Banshee84%
$0.12↑#273080.00↓21.0 years↑
"When this creature enters, target creature gets -2/-2 until end of turn."
Skulking Killer84%
$0.10↑#252650.00↓4.8 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%
$0.12↑#20338↑0.00↓2.4 years↓
"When this creature enters, target creature an opponent controls gets -2/-2 until end of turn."
Topplegeist82%
$0.20↑#9550↑0.62↑10.5 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."
Scorpion's Sting81%
$0.15↑#14090↑0.22↓1.0 years↓
"Target creature gets -3/-3 until end of turn."
Grandmother Sengir80%
$1.09↑#293430.27↓30.9 years↑
"
, 
: Target creature gets -1/-1 until end of turn."
, : Target creature gets -1/-1 until end of turn."
Obsessive Skinner80%
$0.18↑#14106↑0.21↓10.4 years
"At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, put a +1/+1 counter on target creature."
Wring Flesh80%
$0.06↑#277260.00↓15.1 years↑
"Target creature gets -3/-1 until end of turn."
Death Wind80%
$0.07↑#17164↑0.5614.3 years↑
"Target creature gets -X/-X until end of turn."
Fatal Fumes80%
$0.02↓#293710.00↓13.3 years↑
"Target creature gets -4/-2 until end of turn."
Tar Snare80%
$0.05#299070.00↓10.6 years
"Target creature gets -3/-2 until end of turn."
Strangling Spores80%
$0.07↑#291420.26↓8.1 years↓
"Target creature gets -3/-3 until end of turn."
Last Gasp80%
$0.04↓#16666↑0.27↓20.9 years↑
"Target creature gets -3/-3 until end of turn."
Pull Under80%
$0.12↑#301250.06↓21.9 years↑
"Target creature gets -5/-5 until end of turn."