River Sneak 
Creature — Merfolk Warrior
$0.24 #13811 0.00 9.1 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.
Mist-Cloaked Herald92%
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"This creature can't be blocked."
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"This creature can't be blocked."
Slither Blade92%
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"This creature can't be blocked."
Phantom Warrior92%
$0.06↓#19231↓0.23↑29.5 years↑
"This creature can't be blocked."
Latch Seeker92%
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"This creature can't be blocked."
Covert Operative92%
$0.19↓#29822↓0.17↑23.7 years↑
"This creature can't be blocked."
Metathran Soldier92%
$0.26↑#22717↓0.0727.4 years↑
"This creature can't be blocked."
Storm Fleet Sprinter92%
$0.19↓#111420.26↑8.8 years
"This creature can't be blocked."
Plasma Elemental92%
$0.20↓#30214↓0.0022.4 years↑
"This creature can't be blocked."
Azorius Knight-Arbiter92%
$0.11↓#21992↓0.067.7 years↓
"This creature can't be blocked."
Tidal Kraken92%
$0.72↑#19336↓0.0027.0 years↑
"This creature can't be blocked."
Phantom Ninja92%
$0.28↑#112150.12↑7.4 years↓
"This creature can't be blocked."
Talas Warrior92%
$5.52↑#26061↓0.12↑28.3 years↑
"This creature can't be blocked."
Ghost, Spectral Saboteur91%
$0.19↓#20720↓0.27↑0.3 years↓
"this card can't be blocked."
Wraith, Vicious Vigilante91%
$0.19↓#115820.13↑1.1 years↓
"this card can't be blocked."
Deeproot Elite88%
$0.27↑#5970↑0.38↑8.8 years
"Whenever another Merfolk you control enters, put a +1/+1 counter on target Merfolk you control."
Invisible Stalker88%
$0.77↑#2696↑0.39↑15.1 years↑
"This creature can't be blocked."
Wanderwine Hub86%
$0.82↑#138390.0819.0 years↑
"As this land enters, you may reveal a Merfolk card from your hand. If you don't, this land enters tapped."
Jade Bearer86%
$0.08↓#22827↓0.25↑8.8 years
"When this creature enters, put a +1/+1 counter on another target Merfolk you control."