River Sneak 
Creature — Merfolk Warrior
$0.21 #13661 0.41 8.9 years
This creature can't be blocked.
Whenever another Merfolk you control enters, this creature gets +1/+1 until end of turn.
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Cards similar to River Sneak 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.
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"This creature can't be blocked."
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Covert Operative92%
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"This creature can't be blocked."
Phantom Warrior92%
$0.06↓#18942↓0.07↓29.3 years↑
"This creature can't be blocked."
Tidal Kraken92%
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"This creature can't be blocked."
Phantom Ninja92%
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"This creature can't be blocked."
Storm Fleet Sprinter92%
$0.23↑#10840↑0.15↓8.6 years
"This creature can't be blocked."
Mist-Cloaked Herald92%
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"This creature can't be blocked."
Metathran Soldier92%
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"This creature can't be blocked."
Talas Warrior92%
$5.56↑#25677↓0.88↑28.2 years↑
"This creature can't be blocked."
Jhessian Infiltrator92%
$0.21#20176↓0.3817.9 years↑
"This creature can't be blocked."
Slither Blade92%
$0.36↑#1728↑0.319.4 years
"This creature can't be blocked."
Invisible Stalker92%
$0.62↑#2676↑0.3214.9 years↑
"This creature can't be blocked."
Triton Shorestalker92%
$0.32↑#2014↑0.16↓12.3 years↑
"This creature can't be blocked."
Ghost, Spectral Saboteur91%
$0.22↑#21621↓0.00↓0.2 years↓
"this card can't be blocked."
Wraith, Vicious Vigilante91%
$0.25↑#122820.501.0 years↓
"this card can't be blocked."
Deeproot Elite88%
$0.28↑#5868↑0.24↓8.6 years
"Whenever another Merfolk you control enters, put a +1/+1 counter on target Merfolk you control."
Mystic of the Hidden Way88%
$0.05↓#26835↓0.12↓11.9 years↑
"This creature can't be blocked."
Wanderwine Hub86%
$0.83↑#138000.05↓18.9 years↑
"As this land enters, you may reveal a Merfolk card from your hand. If you don't, this land enters tapped."