Squad Captain 

Creature — Human Soldier
$0.05 #20336 0.29 7.2 years
Vigilance (Attacking doesn't cause this creature to tap.)
This creature enters with a +1/+1 counter on it for each other creature you control.
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Cards similar to Squad Captain 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.
Sheriff of Safe Passage96%
$0.18↑#174610.07↓2.4 years↓
"This creature enters with a +1/+1 counter on it plus an additional +1/+1 counter on it for each other creature you control."
Luxknight Breacher94%
$0.14↑#13885↑0.09↓1.1 years↓
"This creature enters with a +1/+1 counter on it for each other creature and/or artifact you control."
Crowd-Control Warden92%
$0.11↑#219510.00↓2.6 years↓
"As this creature enters or is turned face up, put X +1/+1 counters on it, where X is the number of other creatures you control."
Boss's Chauffeur88%
$0.19↑#6475↑0.14↓4.4 years↓
"This creature enters with a number of +1/+1 counters on it equal to one plus the number of other creatures you control."
Custodi Soulbinders86%
$0.15↑#14032↑0.47↑12.2 years↑
"This creature enters with X +1/+1 counters on it, where X is the number of other creatures on the battlefield."
Stag Beetle84%
$0.70↑#206550.2523.9 years↑
"This creature enters with X +1/+1 counters on it, where X is the number of other creatures on the battlefield."
Shanna, Sisay's Legacy80%
$0.07↑#10598↑0.358.4 years↑
"this card gets +1/+1 for each creature you control."
Leonardo, Big Brother78%
$0.20↑#14581↑0.00↓0.5 years↓
"this card gets +1/+0 for each other creature you control."
Savage Firecat76%
$0.28↑#30772↓0.2424.9 years↑
"This creature enters with seven +1/+1 counters on it."
Faithful Watchdog76%
$0.17↑#8717↑0.242.2 years↓
"This creature enters with three +1/+1 counters on it."
+1 more matching line
Adaptive Shimmerer76%
$0.12↑#231690.00↓6.4 years
"This creature enters with three +1/+1 counters on it."
Avatar of the Resolute74%
$0.30↑#169600.2611.4 years↑
"This creature enters with a +1/+1 counter on it for each other creature you control with a +1/+1 counter on it."