Sludge Monster 
Creature — Horror
$0.46 #4093 0.73 5.1 years
Whenever this creature enters or attacks, put a slime counter on up to one other target creature.
Non-Horror creatures with slime counters on them lose all abilities and have base power and toughness 2/2.
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Cards similar to Sludge Monster 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.
Kasmina's Transmutation78%
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"Enchanted creature loses all abilities and has base power and toughness 1/1."
Spitting Dilophosaurus78%
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"Whenever this creature enters or attacks, put a -1/-1 counter on up to one target creature."
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Warkite Marauder77%
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"Whenever this creature attacks, target creature defending player controls loses all abilities and has base power and toughness 0/1 until end of turn."
Bifur, Melodic Rider76%
$0.24↓#9843↓0.12↓0.2 years↓
"Whenever this card enters or attacks, put a +1/+1 counter on target creature."
Haliya, Ascendant Cadet76%
$0.25↓#9247↓0.12↓1.2 years↓
"Whenever this card enters or attacks, put a +1/+1 counter on target creature you control."
Dwalin, Weaponmaster76%
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"Whenever this card enters or attacks, put a hone counter on each Equipment you control."
Humility75%
$73.63↑#11727↓2.48↑29.0 years↑
"All creatures lose all abilities and have base power and toughness 1/1."
Haazda Vigilante74%
$0.03↓#27808↓0.00↓2.7 years↓
"Whenever this creature enters or attacks, put a +1/+1 counter on target creature you control with power 2 or less."
Grave Titan74%
$0.27↓#1373↑0.23↓16.3 years↑
"Whenever this creature enters or attacks, create two 2/2 black Zombie creature tokens."
Inspirited Vanguard74%
$0.06↓#20848↓0.00↓1.5 years↓
"Whenever this creature enters or attacks, it endures 2."
Reprobation74%
$0.28↓#5799↓0.60↓7.4 years↑
"Enchanted creature loses all abilities and is a Coward creature with base power and toughness 0/1."
Flatline73%
$0.42↓#7470↓0.06↓3.0 years↓
"Creatures your opponents control have base power and toughness 0/1 until end of turn."
Utter Insignificance72%
$0.14↓#7167↓0.40↓2.3 years↓
"Enchanted creature loses all abilities and has base power and toughness 1/1."
Godhead of Awe72%
$4.45↑#20812↓1.11↑18.5 years↑
"Other creatures have base power and toughness 1/1."
Overlord of the Boilerbilges72%
$2.10↑#46350.07↓2.1 years↓
"Whenever this permanent enters or attacks, it deals 4 damage to any target."
Ovinize72%
$0.07↓#17539↓0.39↓19.7 years↑
"Until end of turn, target creature loses all abilities and has base power and toughness 0/1."
Vengeful Ancestor71%
$0.49↑#2094↑0.30↓5.2 years
"Whenever this creature enters or attacks, goad target creature."
Nadaar, Selfless Paladin71%
$0.35↓#6563↓0.12↓5.2 years
"Whenever this card enters or attacks, venture into the dungeon."
Storvald, Frost Giant Jarl71%
$0.58↑#11630↓0.60↓5.2 years
"Whenever this card enters or attacks, choose one or both —"
+1 more matching line
Sidisi, Brood Tyrant70%
$1.05↑#35670.31↓12.1 years↑
"Whenever this card enters or attacks, mill three cards."