Jade Guardian 

Creature — Merfolk Shaman
$0.23 #25787 0.07 9.1 years
Hexproof (This creature can't be the target of spells or abilities your opponents control.)
When this creature enters, put a +1/+1 counter on target Merfolk you control.
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Cards similar to Jade Guardian 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.
Jade Bearer98%
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"When this creature enters, put a +1/+1 counter on another target Merfolk you control."
Deeproot Elite93%
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"Whenever another Merfolk you control enters, put a +1/+1 counter on target Merfolk you control."
Vineshaper Mystic92%
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"When this creature enters, put a +1/+1 counter on each of up to two target Merfolk you control."
Wanderwine Hub88%
$0.82↑#13839↑0.0819.0 years↑
"As this land enters, you may reveal a Merfolk card from your hand. If you don't, this land enters tapped."
River Heralds' Boon86%
$0.09↓#250420.129.1 years
"Put a +1/+1 counter on target creature and a +1/+1 counter on up to one target Merfolk."
River Sneak82%
$0.24↑#13811↑0.009.1 years
"Whenever another Merfolk you control enters, this creature gets +1/+1 until end of turn."