Sludge Monster 
Creature — Horror
$0.61 #3977 0.55 4.9 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%
$0.12↓#7400↓0.517.3 years↑
"Enchanted creature loses all abilities and has base power and toughness 1/1."
Spitting Dilophosaurus78%
$26.78↑#5609↓0.78↑2.8 years↓
"Whenever this creature enters or attacks, put a -1/-1 counter on up to one target creature."
+1 more matching line
Warkite Marauder77%
$0.27↓#6445↓0.38↓8.6 years↑
"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%
$0.28↓#11978↓0.00↓0.1 years↓
"Whenever this card enters or attacks, put a +1/+1 counter on target creature."
Haliya, Ascendant Cadet76%
$0.21↓#9401↓0.28↓1.1 years↓
"Whenever this card enters or attacks, put a +1/+1 counter on target creature you control."
Dwalin, Weaponmaster76%
$0.40↓#11888↓0.00↓0.1 years↓
"Whenever this card enters or attacks, put a hone counter on each Equipment you control."
Humility75%
$71.64↑#11600↓2.51↑28.9 years↑
"All creatures lose all abilities and have base power and toughness 1/1."
Haazda Vigilante74%
$0.02↓#27483↓0.06↓2.6 years↓
"Whenever this creature enters or attacks, put a +1/+1 counter on target creature you control with power 2 or less."
Grave Titan74%
$0.35↓#1404↑0.21↓16.1 years↑
"Whenever this creature enters or attacks, create two 2/2 black Zombie creature tokens."
Inspirited Vanguard74%
$0.07↓#20715↓0.16↓1.4 years↓
"Whenever this creature enters or attacks, it endures 2."
Reprobation74%
$0.32↓#5741↓0.67↑7.2 years↑
"Enchanted creature loses all abilities and is a Coward creature with base power and toughness 0/1."
Godhead of Awe72%
$4.32↑#20552↓0.5018.3 years↑
"Other creatures have base power and toughness 1/1."
Overlord of the Boilerbilges72%
$1.74↑#45150.21↓1.9 years↓
"Whenever this permanent enters or attacks, it deals 4 damage to any target."
Flatline72%
$0.40↓#7290↓0.592.9 years↓
"Creatures your opponents control have base power and toughness 0/1 until end of turn."
Utter Insignificance72%
$0.24↓#6992↓0.28↓2.2 years↓
"Enchanted creature loses all abilities and has base power and toughness 1/1."
Ovinize72%
$0.09↓#17234↓0.09↓19.6 years↑
"Until end of turn, target creature loses all abilities and has base power and toughness 0/1."
Vengeful Ancestor71%
$0.37↓#2070↑0.28↓5.1 years
"Whenever this creature enters or attacks, goad target creature."
Storvald, Frost Giant Jarl71%
$0.59↓#11412↓0.535.1 years
"Whenever this card enters or attacks, choose one or both —"
+1 more matching line
Illusory Wrappings71%
$0.07↓#27879↓0.20↓9.4 years↑
"Enchanted creature has base power and toughness 0/2."
Reduce in Stature71%
$0.03↓#28702↓0.35↓11.4 years↑
"Enchanted creature has base power and toughness 0/2."