Obsessive Skinner 
Creature — Human Rogue
$0.18 #14106 0.21 10.4 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 Swallower88%
$0.22↑#168380.2910.4 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%
$0.20↑#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."
Tooth Collector80%
$0.05↓#25459↓0.47↑10.5 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 Beatdown80%
$0.18#143960.251.9 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 Scribe80%
$0.34↑#10043↑0.00↓10.4 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."
Backup Agent80%
$0.17↓#21067↓0.00↓4.4 years↓
"When this creature enters, put a +1/+1 counter on target creature."
Jeong Jeong's Deserters80%
$0.14↓#148980.00↓0.8 years↓
"When this creature enters, put a +1/+1 counter on target creature."
Timberland Guide80%
$0.04↓#21257↓0.2714.3 years↑
"When this creature enters, put a +1/+1 counter on target creature."
Ironshell Beetle80%
$0.11↓#19488↓0.2724.3 years↑
"When this creature enters, put a +1/+1 counter on target creature."
Ironpaw Aspirant80%
$0.15↓#157960.00↓2.8 years↓
"When this creature enters, put a +1/+1 counter on target creature."
Satyr Grovedancer80%
$0.09↓#21421↓0.2612.3 years↑
"When this creature enters, put a +1/+1 counter on target creature."
Dauntless Survivor80%
$0.08↓#22027↓0.39↑5.9 years↓
"When this creature enters, put a +1/+1 counter on target creature."
Bond Beetle80%
$0.12↓#163610.2814.1 years↑
"When this creature enters, put a +1/+1 counter on target creature."
Gibbering Fiend78%
$0.28↑#136710.38↑10.4 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."
Supply-Line Cranes78%
$0.05↓#29107↓0.07↓12.3 years↑
"When this creature enters, put a +1/+1 counter on target creature."
Kinsbaile Courier78%
$0.16↓#23439↓0.285.8 years↓
"When this creature enters, put a +1/+1 counter on target creature."
Omnivorous Flytrap76%
$0.18#133490.181.9 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."
Iron Bully74%
$0.05↓#20531↓0.177.3 years↓
"When this creature enters, put a +1/+1 counter on target creature."
Dueling Coach72%
$0.04↓#23769↓0.41↑5.4 years↓
"When this creature enters, put a +1/+1 counter on target creature."
Dusk Feaster72%
$0.09↓#29635↓0.40↑10.1 years
"This spell costs 
less to cast if there are four or more card types among cards in your graveyard."
less to cast if there are four or more card types among cards in your graveyard."