Big Mother Mouser 
Artifact Creature — Robot
$2.05 #5279 0.00 0.5 years
This creature enters with two +1/+1 counters on it.
Whenever this creature attacks, double the number of +1/+1 counters on it.
When this creature dies, create a number of 1/1 colorless Robot artifact creature tokens equal to the number of +1/+1 counters on this creature.
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Cards similar to Big Mother Mouser 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.
Hangarback Walker92%
$0.26↓#1531↑0.34↑11.1 years↑
"When this creature dies, create a 1/1 colorless Thopter artifact creature token with flying for each +1/+1 counter on this creature."
+1 more matching line
Lily Bowen, Raging Grandma92%
$0.51↓#6967↓0.002.5 years↑
"this card enters with two +1/+1 counters on it."
Hooded Hydra90%
$0.75↓#3354↑0.13↑11.9 years↑
"When this creature dies, create a 1/1 green Snake creature token for each +1/+1 counter on it."
+2 more matching lines
Mossborn Hydra90%
$12.69↑#777↑0.75↑1.8 years↑
"This creature enters with a +1/+1 counter on it."
Kalonian Hydra89%
$5.87↑#1120↑0.45↑13.1 years↑
"Whenever this creature attacks, double the number of +1/+1 counters on each creature you control."
+1 more matching line
Boss's Chauffeur88%
$0.19↓#6475↓0.14↑4.4 years↑
"When this creature dies, create a 1/1 green and white Citizen creature token for each +1/+1 counter on it."
+1 more matching line
Grakmaw, Skyclave Ravager86%
$0.36↓#10052↓0.32↑5.9 years↑
"When this card dies, create an X/X black and green Hydra creature token, where X is the number of +1/+1 counters on this card."
+1 more matching line
Symbiotic Beast86%
$0.08↓#20468↓0.0023.9 years↑
"When this creature dies, create four 1/1 green Insect creature tokens."
Symbiotic Elf86%
$0.13↓#28657↓0.29↑23.9 years↑
"When this creature dies, create two 1/1 green Insect creature tokens."
Maalfeld Twins86%
$0.05↓#19051↓0.33↑14.3 years↑
"When this creature dies, create two 2/2 black Zombie creature tokens."
Symbiotic Wurm86%
$2.16↑#15731↓0.61↑23.9 years↑
"When this creature dies, create seven 1/1 green Insect creature tokens."
Sprouting Thrinax86%
$0.13↓#11737↓0.25↑17.9 years↑
"When this creature dies, create three 1/1 green Saproling creature tokens."
Ascendant Acolyte86%
$0.34↓#10992↓0.064.5 years↑
"At the beginning of your upkeep, double the number of +1/+1 counters on this creature."
+1 more matching line
Ornery Tumblewagg86%
$0.34↓#49900.90↑2.4 years↑
"Whenever this creature attacks while saddled, double the number of +1/+1 counters on target creature."
Mitotic Slime86%
$0.32↓#8715↓0.12↑16.1 years↑
"When this creature dies, create two 2/2 green Ooze creature tokens. They have "When this token dies, create two 1/1 green Ooze creature tokens.""
Hulk, Strongest There Is85%
$0.82↓#16769↓0.000.2 years
"this card enters with a +1/+1 counter on him."
Chasm Skulker84%
$0.31↓#706↑0.23↑12.1 years↑
"When this creature dies, create X 1/1 blue Squid creature tokens with islandwalk, where X is the number of +1/+1 counters on this creature."
Wriggling Grub83%
$0.37↓#8213↓0.091.8 years↑
"When this creature dies, create two 1/1 black and green Worm creature tokens."
Primordial Hydra83%
$1.39↓#2463↑0.45↑15.1 years↑
"At the beginning of your upkeep, double the number of +1/+1 counters on this creature."
+1 more matching line
Conclave Cavalier83%
$0.17↓#21896↓0.19↑7.9 years↑
"When this creature dies, create two 2/2 green and white Elf Knight creature tokens with vigilance."