Elvish Vanguard 
Creature — Elf Warrior
$0.55 #14277 0.33 23.9 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%
$0.29↓#19881↓0.89↑23.6 years
"Whenever another nontoken Elf enters, you may create a 1/1 green Insect creature token."
Marwyn, the Nurturer82%
$5.42↑#1205↑0.55↑8.4 years↓
"Whenever another Elf you control enters, put a +1/+1 counter on this card."
Immaculate Magistrate72%
$1.24↑#3447↑0.2518.9 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%
$4.50↑#4930↑0.04↓18.9 years↓
"As this land enters, you may reveal an Elf card from your hand. If you don't, this land enters tapped."
Woodland Weavemaster72%
$0.24↓#159470.00↓0.1 years↓
"Whenever another Elf you control enters, this creature gets +1/+1 until end of turn."
Foe-liage71%
$0.29↓#26372↓0.00↓0.5 years↓
"Whenever a land enters during your turn, put a +1/+1 counter on this creature."
Hamletback Goliath70%
$0.19↓#9036↑0.00↓18.9 years↓
"Whenever another creature enters, you may put X +1/+1 counters on this creature, where X is that creature's power."