Yoshimaru, Ever Faithful 
Legendary Creature — Dog
$8.23 #4291 0.54 4.5 years
Whenever another legendary permanent you control enters, put a +1/+1 counter on Yoshimaru.
Partner (You can have two commanders if both have partner.)
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Cards similar to Yoshimaru, Ever Faithful 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.
Kodama of the East Tree84%
$3.77↓#975↑0.92↑5.8 years↑
"Partner"
Slurrk, All-Ingesting81%
$0.29↓#9671↓0.41↓5.8 years↑
"Partner"
Legolas Greenleaf78%
$0.36↓#5747↓0.04↓3.2 years↓
"Whenever another legendary creature you control enters, put a +1/+1 counter on Legolas."
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$13.07↑#3165↑0.29↓3.2 years↓
"Whenever another legendary creature you control enters, put a +1/+1 counter on Gimli."
Keleth, Sunmane Familiar77%
$0.21↓#6749↓0.00↓5.8 years↑
"Partner"
Sengir, the Dark Baron76%
$0.28↓#11001↓0.25↓5.8 years↑
"Partner"
Rograkh, Son of Rohgahh76%
$1.83↓#2355↑0.66↑5.8 years↑
"Partner"
Kellan Joins Up74%
$0.32↓#7591↓0.28↓2.4 years↓
"Whenever a legendary creature you control enters, put a +1/+1 counter on each creature you control."
Francisco, Fowl Marauder74%
$0.25↓#6865↓0.07↓2.8 years↓
"Partner"
Nadier, Agent of the Duskenel73%
$0.31↓#11546↓0.18↓5.8 years↑
"Partner"
Ishai, Ojutai Dragonspeaker73%
$3.29↓#46680.599.8 years↑
"Partner"
Cryptid Inspector72%
$0.12↓#17216↓0.11↓1.9 years↓
"Whenever a face-down permanent you control enters and whenever this creature or another permanent you control is turned face up, put a +1/+1 counter on this creature."
Hero's Blade72%
$0.16↓#1871↑0.15↓11.6 years↑
"Whenever a legendary creature you control enters, you may attach this Equipment to it."
Anara, Wolvid Familiar72%
$0.79↓#40650.27↓5.8 years↑
"Partner"
Tana, the Bloodsower71%
$4.48↓#14033↓0.86↑9.8 years↑
"Partner"
Numa, Joraga Chieftain71%
$0.24↓#13190↓0.605.8 years↑
"Partner"
Halana, Kessig Ranger71%
$0.34↓#10184↓0.19↓5.8 years↑
"Partner"
Ich-Tekik, Salvage Splicer71%
$0.29↓#11116↓0.11↓5.8 years↑
"Partner"
Jedit Ojanen, Mercenary70%
$0.37↓#20796↓0.40↓4.0 years
"Whenever this card or another legendary creature you control enters, you may pay 
. If you do, create a 2/2 green Cat Warrior creature token with forestwalk."
. If you do, create a 2/2 green Cat Warrior creature token with forestwalk."
Eligeth, Crossroads Augur70%
$0.32↓#11895↓0.465.8 years↑
"Partner"