Elvish Vanguard 
Creature — Elf Warrior
$0.45 #14471 0.20 24.0 years
Whenever another Elf enters, put a +1/+1 counter on this creature.
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Cards similar to Elvish Vanguard 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.
Wirewood Hivemaster88%
$0.27↓#20146↓0.1723.7 years
"Whenever another nontoken Elf enters, you may create a 1/1 green Insect creature token."
Marwyn, the Nurturer82%
$5.85↑#1206↑0.62↑8.5 years↓
"Whenever another Elf you control enters, put a +1/+1 counter on this card."
Immaculate Magistrate74%
$1.91↑#3393↑0.2319.0 years↓
"
: Put a +1/+1 counter on target creature for each Elf you control."
: Put a +1/+1 counter on target creature for each Elf you control."
Gilt-Leaf Palace72%
$4.55↑#4955↑0.00↓19.0 years↓
"As this land enters, you may reveal an Elf card from your hand. If you don't, this land enters tapped."
Woodland Weavemaster72%
$0.26↓#128690.170.2 years↓
"Whenever another Elf you control enters, this creature gets +1/+1 until end of turn."
Foe-liage70%
$0.18↓#25936↓0.160.6 years↓
"Whenever a land enters during your turn, put a +1/+1 counter on this creature."
Hamletback Goliath70%
$0.20↓#9218↑0.06↓19.0 years↓
"Whenever another creature enters, you may put X +1/+1 counters on this creature, where X is that creature's power."