Bellowing Aegisaur 

Creature — Dinosaur
$0.15 #7982 0.17 9.1 years
Enrage — Whenever this creature is dealt damage, put a +1/+1 counter on each other creature you control.
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Cards similar to Bellowing Aegisaur 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.
Victory's Envoy88%
$0.32↑#10210↓0.44↑6.7 years↓
"At the beginning of your upkeep, put a +1/+1 counter on each other creature you control."
Generous Pup86%
$8.83↑#5299↑0.141.9 years↓
"Whenever one or more +1/+1 counters are put on this creature, put a +1/+1 counter on each other creature you control. This ability triggers only once each turn."
Ridgescale Tusker84%
$0.11↓#17785↓0.06↓9.7 years
"When this creature enters, put a +1/+1 counter on each other creature you control."
Supply Runners84%
$0.18↑#13859↓0.00↓6.3 years↓
"When this creature enters, put a +1/+1 counter on each other creature you control."
Web-Warriors84%
$0.23↑#93730.201.1 years↓
"When this creature enters, put a +1/+1 counter on each other creature you control."
The Falcon, Sam Wilson83%
$0.20↑#25207↓0.260.3 years↓
"When this card enters, put a +1/+1 counter on each other creature you control."
Basri's Solidarity82%
$0.12↓#10443↓0.06↓6.3 years↓
"Put a +1/+1 counter on each creature you control."
Strength of the Pack82%
$0.09↓#19075↓0.07↓8.8 years
"Put two +1/+1 counters on each creature you control."
Katara, Heroic Healer80%
$0.59↑#12958↓0.120.9 years↓
"When this card enters, put a +1/+1 counter on each other creature you control."
Thunderwolf Cavalry79%
$0.35↑#15634↓0.00↓4.0 years↓
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on each other creature you control."
Guiding Hydra78%
$0.43↑#16361↓0.160.0 years↓
"At the beginning of combat on your turn, you may remove a +1/+1 counter from this creature. If you do, put a +1/+1 counter on each other creature you control."
Rite of Passage78%
$4.95↑#5725↑0.28↑22.4 years↑
"Whenever a creature you control is dealt damage, put a +1/+1 counter on it."
Borborygmos78%
$0.38↑#17308↓0.2420.7 years↑
"Whenever this card deals combat damage to a player, put a +1/+1 counter on each creature you control."
Saber Ants78%
$0.32↑#13313↓0.1227.0 years↑
"Whenever this creature is dealt damage, you may create that many 1/1 green Insect creature tokens."
Wall of Resistance78%
$0.23↑#21768↓0.1830.0 years↑
"At the beginning of each end step, if this creature was dealt damage this turn, put a +0/+1 counter on it."
Gavony Township77%
$2.37↑#1004↑0.1415.1 years↑
"

,
: Put a +1/+1 counter on each creature you control."
Brokers Ascendancy77%
$2.35↑#2866↑0.224.5 years↓
"At the beginning of your end step, put a +1/+1 counter on each creature you control and a loyalty counter on each planeswalker you control."
Mikaeus, the Lunarch76%
$0.49↑#2007↑0.2615.2 years↑
"
, Remove a +1/+1 counter from this card: Put a +1/+1 counter on each other creature you control."