Obsessive Skinner 
Creature — Human Rogue
$0.22 #14612 0.12 10.5 years
When this creature enters, put a +1/+1 counter on target creature.
Delirium — 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.
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Cards similar to Obsessive Skinner 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.
Soul Swallower89%
$0.25↑#173310.2010.5 years
"At the beginning of your upkeep, if there are four or more card types among cards in your graveyard, put three +1/+1 counters on this creature."
Topplegeist84%
$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."
Jeong Jeong's Deserters83%
$0.10↓#149210.070.9 years↓
"When this creature enters, put a +1/+1 counter on target creature."
Ironshell Beetle83%
$0.10↓#19849↓0.00↓24.4 years↑
"When this creature enters, put a +1/+1 counter on target creature."
Timberland Guide83%
$0.05↓#21628↓0.00↓14.5 years↑
"When this creature enters, put a +1/+1 counter on target creature."
Bond Beetle83%
$0.16↓#166620.1114.3 years↑
"When this creature enters, put a +1/+1 counter on target creature."
Ironpaw Aspirant83%
$0.19↓#162250.00↓2.9 years↓
"When this creature enters, put a +1/+1 counter on target creature."
Dauntless Survivor83%
$0.14↓#22349↓0.25↑6.1 years↓
"When this creature enters, put a +1/+1 counter on target creature."
Satyr Grovedancer83%
$0.13↓#21527↓0.00↓12.5 years↑
"When this creature enters, put a +1/+1 counter on target creature."
Backup Agent83%
$0.14↓#21428↓0.074.5 years↓
"When this creature enters, put a +1/+1 counter on target creature."
Iron Bully82%
$0.06↓#20774↓0.067.5 years↓
"When this creature enters, put a +1/+1 counter on target creature."
Supply-Line Cranes82%
$0.05↓#29464↓0.00↓12.5 years↑
"When this creature enters, put a +1/+1 counter on target creature."
Tooth Collector79%
$0.05↓#25910↓0.1810.6 years
"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."
Beastie Beatdown79%
$0.18↓#147150.00↓2.1 years↓
"If there are four or more card types among cards in your graveyard, put two +1/+1 counters on the creature you control."
Manic Scribe79%
$0.30↑#10359↑0.40↑10.5 years
"At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, that player mills three cards."
Kinsbaile Courier79%
$0.15↓#23799↓0.00↓5.9 years↓
"When this creature enters, put a +1/+1 counter on target creature."
Omnivorous Flytrap77%
$0.24↑#138370.67↑2.1 years↓
"Whenever this creature enters or attacks, if there are four or more card types among cards in your graveyard, distribute two +1/+1 counters among one or two target creatures. Then if there are six or more card types among cards in your graveyard, double the number of +1/+1 counters on those creatures."
Sunshower Druid77%
$0.23↑#6881↑0.00↓2.2 years↓
"When this creature enters, put a +1/+1 counter on target creature and you gain 1 life."
Gibbering Fiend76%
$0.32↑#140860.00↓10.5 years
"At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, this creature deals 1 damage to that player."
Savageborn Hydra76%
$0.45↑#117400.1213.5 years↑
"This creature enters with X +1/+1 counters on it."