Oran-Rief Ooze 
Creature — Ooze
$0.30 #7852 0.56 5.9 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 Coach95%
$0.04↓#23769↓0.41↓5.4 years
"When this creature enters, put a +1/+1 counter on target creature."
+1 more matching line
Casey Jones, Back Alley Brute90%
$0.31↑#76430.00↓0.5 years↓
"Whenever this card attacks, put a +1/+1 counter on target attacking creature."
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
Leatherhead, Iron Gator86%
$0.30#92210.00↓0.5 years↓
"Whenever this card attacks, put two +1/+1 counters on each creature you control."
Renegade Krasis86%
$0.32↑#14878↓0.19↓13.3 years↑
"Whenever this creature evolves, put a +1/+1 counter on each other creature you control with a +1/+1 counter on it."
Lifecrafter's Gift86%
$0.06↓#15832↓0.11↓9.6 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."
Byrke, Long Ear of the Law86%
$6.85↑#5927↑0.29↓2.1 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
Rubblebelt Raiders84%
$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."
Fangren Firstborn84%
$2.32↑#15553↓0.17↓22.6 years↑
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature."
Twisted Spider-Clone84%
$0.26↓#17113↓0.480.9 years↓
"When this creature enters, put a +1/+1 counter on each creature you control with a +1/+1 counter on it."
Patron of the Valiant84%
$0.10↓#15044↓0.38↓11.1 years↑
"When this creature enters, put a +1/+1 counter on each creature you control with a +1/+1 counter on it."
Tenured Inkcaster82%
$0.09↓#13962↓0.00↓5.4 years
"When this creature enters, put a +1/+1 counter on target creature."
+1 more matching line
Urdnan, Dromoka Warrior82%
$0.37↑#78420.13↓1.8 years↓
"When this card enters, put a +1/+1 counter on target creature."
Pridemalkin82%
$0.18↓#4361↑0.05↓6.2 years
"When this creature enters, put a +1/+1 counter on target creature you control."
Hulk, Strongest There Is80%
$0.82↑#16769↓0.00↓0.2 years↓
"this card enters with a +1/+1 counter on him."
Armory of Iroas80%
$0.22↓#79370.22↓12.3 years↑
"Whenever equipped creature attacks, put a +1/+1 counter on it."
Bone Sabres80%
$5.73↑#5958↑0.24↓3.9 years↓
"Whenever equipped creature attacks, put four +1/+1 counters on it."
Duskshell Crawler80%
$0.30#1418↑0.17↓5.2 years
"When this creature enters, put a +1/+1 counter on target creature."
Dromoka Captain79%
$0.11↓#26142↓0.00↓11.4 years↑
"Whenever this creature attacks, bolster 1."
Kujar Seedsculptor78%
$0.07↓#21641↓0.24↓9.9 years↑
"When this creature enters, put a +1/+1 counter on target creature you control."