Big Mother Mouser 
Artifact Creature — Robot
$1.28 #4796 0.31 0.6 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%
$0.25↓#1516↑0.3011.3 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%
$0.46↓#7080↓0.252.6 years↑
"this card enters with two +1/+1 counters on it."
Mossborn Hydra90%
$13.45↑#747↑0.95↑1.9 years↑
"This creature enters with a +1/+1 counter on it."
Hooded Hydra88%
$0.62↓#3439↑0.17↓12.1 years↑
"When this creature dies, create a 1/1 green Snake creature token for each +1/+1 counter on it."
+2 more matching lines
Boss's Chauffeur88%
$0.26↓#6650↓0.06↓4.5 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%
$0.35↓#10333↓0.266.1 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
Kalonian Hydra86%
$6.14↑#1136↑0.48↑13.3 years↑
"Whenever this creature attacks, double the number of +1/+1 counters on each creature you control."
+1 more matching line
Symbiotic Beast86%
$0.06↓#20773↓0.00↓24.0 years↑
"When this creature dies, create four 1/1 green Insect creature tokens."
Symbiotic Elf86%
$0.14↓#29043↓0.07↓24.0 years↑
"When this creature dies, create two 1/1 green Insect creature tokens."
Maalfeld Twins86%
$0.08↓#19198↓0.07↓14.5 years↑
"When this creature dies, create two 2/2 black Zombie creature tokens."
Symbiotic Wurm86%
$2.27↑#16073↓0.2224.0 years↑
"When this creature dies, create seven 1/1 green Insect creature tokens."
Sprouting Thrinax86%
$0.10↓#12004↓0.00↓18.0 years↑
"When this creature dies, create three 1/1 green Saproling creature tokens."
Ascendant Acolyte86%
$0.32↓#11286↓0.294.7 years↑
"At the beginning of your upkeep, double the number of +1/+1 counters on this creature."
+1 more matching line
Ornery Tumblewagg86%
$0.36↓#51810.222.5 years↑
"Whenever this creature attacks while saddled, double the number of +1/+1 counters on target creature."
Mitotic Slime86%
$0.38↓#8381↓0.4116.3 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.""
Chasm Skulker84%
$0.34↓#704↑0.3412.3 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."
Primordial Hydra84%
$1.37↑#2429↑0.55↑15.3 years↑
"At the beginning of your upkeep, double the number of +1/+1 counters on this creature."
+1 more matching line
Hulk, Strongest There Is84%
$0.92↓#15836↓0.47↑0.3 years
"this card enters with a +1/+1 counter on him."
Wriggling Grub83%
$0.36↓#8062↓0.07↓1.9 years↑
"When this creature dies, create two 1/1 black and green Worm creature tokens."
Conclave Cavalier83%
$0.19↓#22237↓0.00↓8.0 years↑
"When this creature dies, create two 2/2 green and white Elf Knight creature tokens with vigilance."