Oran-Rief Ooze 
Creature — Ooze
$0.30 #7813 0.20 6.1 years
When this creature enters, put a +1/+1 counter on target creature you control.
Whenever this creature attacks, put a +1/+1 counter on each attacking creature with a +1/+1 counter on it.
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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.
Dueling Coach96%
$0.09↓#24102↓0.00↓5.5 years
"When this creature enters, put a +1/+1 counter on target creature."
+1 more matching line
Kalonian Hydra92%
$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
Byrke, Long Ear of the Law88%
$7.22↑#6029↑0.142.2 years↓
"Whenever a creature you control with a +1/+1 counter on it attacks, double the number of +1/+1 counters on it."
+1 more matching line
Renegade Krasis88%
$0.32↑#15047↓0.06↓13.5 years↑
"Whenever this creature evolves, put a +1/+1 counter on each other creature you control with a +1/+1 counter on it."
Casey Jones, Back Alley Brute87%
$0.31↑#71790.32↑0.6 years↓
"Whenever this card attacks, put a +1/+1 counter on target attacking creature."
Merfolk Skydiver86%
$0.26↓#67330.06↓7.5 years↑
"When this creature enters, put a +1/+1 counter on target creature you control."
Leatherhead, Iron Gator85%
$0.28↓#87480.34↑0.6 years↓
"Whenever this card attacks, put two +1/+1 counters on each creature you control."
Rubblebelt Raiders85%
$0.13↓#18863↓0.00↓13.7 years↑
"Whenever this creature attacks, put a +1/+1 counter on it for each attacking creature you control."
Hulk, Strongest There Is85%
$0.92↑#15836↓0.47↑0.3 years↓
"this card enters with a +1/+1 counter on him."
Fangren Firstborn84%
$2.18↑#15724↓0.2622.7 years↑
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature."
Tenured Inkcaster82%
$0.12↓#14277↓0.10↓5.5 years
"When this creature enters, put a +1/+1 counter on target creature."
+1 more matching line
Twisted Spider-Clone82%
$0.24↓#17136↓0.42↑1.1 years↓
"When this creature enters, put a +1/+1 counter on each creature you control with a +1/+1 counter on it."
Lifecrafter's Gift82%
$0.06↓#16124↓0.00↓9.7 years↑
"Put a +1/+1 counter on target creature, then put a +1/+1 counter on each creature you control with a +1/+1 counter on it."
Patron of the Valiant81%
$0.10↓#15167↓0.1811.3 years↑
"When this creature enters, put a +1/+1 counter on each creature you control with a +1/+1 counter on it."
Edgar, Moonlit Sovereign81%
$0.22↓#24175↓0.08↓0.0 years↓
"At the beginning of your end step, if you didn't cast a spell this turn, put two +1/+1 counters on this card."
Kujar Seedsculptor80%
$0.06↓#21919↓0.00↓10.1 years↑
"When this creature enters, put a +1/+1 counter on target creature you control."
Teyo's Lightshield80%
$0.09↓#28109↓0.00↓7.5 years↑
"When this creature enters, put a +1/+1 counter on target creature you control."
Pridemalkin80%
$0.23↓#4414↑0.266.3 years
"When this creature enters, put a +1/+1 counter on target creature you control."
Virtuous Variant79%
$0.17↓#28301↓0.130.3 years↓
"When this creature enters, put a +1/+1 counter on target creature you control."
Urdnan, Dromoka Warrior78%
$0.34↑#77070.00↓1.9 years↓
"When this card enters, put a +1/+1 counter on target creature."