Splinter, the Mentor 
Legendary Creature — Mutant Ninja Rat
$0.89 #8711 0.00 0.5 years
Menace
Whenever Splinter or another nontoken creature you control leaves the battlefield, create a Mutagen token.
Partner—Character select (You can have two commanders if both have this ability.)
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Cards similar to Splinter, the Mentor 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.
Donatello, the Brains95%
$0.62↓#72230.000.5 years
"Partner—Character select"
The Ooze88%
$4.06↑#4450↑0.000.5 years
"Whenever a creature you control with a +1/+1 counter on it leaves the battlefield, create a Mutagen token for each +1/+1 counter on it."
Mona Lisa, Ever Adaptable80%
$3.79↑#13899↓0.000.5 years
"Whenever a player casts a creature spell, you create a Mutagen token."
Michelangelo, the Heart80%
$1.19↑#85210.000.5 years
"Partner—Character select"
Raphael, the Muscle78%
$0.69↓#76650.000.5 years
"Partner—Character select"
+1 more matching line
Sophina, Spearsage Deserter78%
$0.36↓#14853↓0.074.9 years↑
"Menace"
Joel, Resolute Survivor77%
$4.45↑#22143↓0.000.9 years
"Menace"
Flaming Fist Officer76%
$0.20↓#20195↓0.004.2 years↑
"Whenever another creature you control leaves the battlefield, put a +1/+1 counter on this creature."
Ninth Bridge Patrol76%
$0.06↓#20275↓0.56↑9.9 years↑
"Whenever another creature you control leaves the battlefield, put a +1/+1 counter on this creature."
Tokka & Rahzar, Unsupervised74%
$0.28↓#12130↓0.000.5 years
"Whenever another nontoken creature you control leaves the battlefield, put a +1/+1 counter on this card and create a Treasure token. This ability triggers only once each turn."
Genghis Frog74%
$0.20↓#15209↓0.000.5 years
"Whenever this card or another Mutant you control enters, create a Mutagen token."
Safana, Calimport Cutthroat74%
$0.10↓#10703↓0.30↑4.2 years↑
"Menace"
April O'Neil, Live on the Scene72%
$0.28↓#10960↓0.000.5 years
"Partner—Character select"
Three Tree Scribe72%
$0.26↓#84640.24↑2.1 years↑
"Whenever this creature or another creature you control leaves the battlefield without dying, put a +1/+1 counter on target creature you control."
Silvar, Devourer of the Free71%
$0.46↓#13792↓0.24↑6.4 years↑
"Menace"
Leonardo, the Balance70%
$0.74↓#82740.000.5 years
"Partner—Character select"
Imperial Cosmographer70%
$0.23↓#30335↓0.000.2 years
"Whenever another creature you control leaves the battlefield without dying, put two +1/+1 counters on this creature."
Suki, Courageous Rescuer70%
$0.30↓#6671↑0.000.8 years
"Whenever another permanent you control leaves the battlefield during your turn, create a 1/1 white Ally creature token. This ability triggers only once each turn."
Roadkill Rodney70%
$0.30↓#12754↓0.000.5 years
"Whenever this creature deals combat damage to a player, create a Mutagen token."
Boggart Brute70%
$0.04↓#18747↓0.0011.1 years↑
"Menace"