Predator Ooze 
Creature — Ooze
$0.18 #6337 0.11 14.6 years
Indestructible (Damage and effects that say "destroy" don't destroy this creature.)
Whenever this creature attacks, put a +1/+1 counter on it.
Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature.
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Cards similar to Predator Ooze 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.
Sengir Vampire98%
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"Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature."
Sengir Bats98%
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"Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature."
Vampiric Dragon96%
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"Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature."
Blood Cultist96%
$0.31↑#17071↓0.1917.9 years↑
"Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature."
Vampiric Embrace90%
$0.32↑#26783↓0.36↑27.9 years↑
"Whenever a creature dealt damage by enchanted creature this turn dies, put a +1/+1 counter on that creature."
Vein Drinker90%
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"Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature."
Garza Zol, Plague Queen90%
$2.01↑#28247↓0.1020.1 years↑
"Whenever a creature dealt damage by this card this turn dies, put a +1/+1 counter on this card."
Trophy Hunter90%
$0.26↑#23399↓0.25↑20.9 years↑
"Whenever a creature with flying dealt damage by this creature this turn dies, put a +1/+1 counter on this creature."
Repentant Vampire90%
$0.54↑#29503↓0.00↓24.9 years↑
"Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature."
Baron Sengir89%
$5.12↑#24600↓0.00↓30.9 years↑
"Whenever a creature dealt damage by this card this turn dies, put a +2/+2 counter on this card."
Zurgo Helmsmasher86%
$0.57↑#10649↓0.28↑12.0 years↓
"Whenever a creature dealt damage by Zurgo this turn dies, put a +1/+1 counter on Zurgo."
+1 more matching line
Vampiric Sliver84%
$1.23↑#20775↓0.25↑19.9 years↑
"All Sliver creatures have "Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature.""
Resplendent Griffin82%
$0.13↓#28436↓0.00↓8.6 years↓
"Whenever this creature attacks, if you have the city's blessing, put a +1/+1 counter on it."
Rubblebelt Raiders81%
$0.13↓#18440↓0.31↑13.6 years
"Whenever this creature attacks, put a +1/+1 counter on it for each attacking creature you control."
Ezio, Brash Novice80%
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"Whenever this card attacks, put a +1/+1 counter on it."
Leatherhead, Iron Gator78%
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"Whenever this card attacks, put two +1/+1 counters on each creature you control."
Untethered Express78%
$0.23↑#12955↓0.00↓9.6 years↓
"Whenever this Vehicle attacks, put a +1/+1 counter on it."
Alesha, Who Laughs at Fate76%
$1.58↑#1779↑0.30↑1.8 years↓
"Whenever this card attacks, put a +1/+1 counter on it."
Fangren Firstborn76%
$2.32↑#15553↓0.1722.6 years↑
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature."
Dromoka Captain76%
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"Whenever this creature attacks, bolster 1."