Herald of Secret Streams 

Creature — Merfolk Warrior
$6.11 #1063 0.57 8.9 years
Creatures you control with +1/+1 counters on them can't be blocked.
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Cards similar to Herald of Secret Streams 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.
Stealth Mission88%
$0.13↓#15664↓0.00↓7.3 years↓
"Put two +1/+1 counters on target creature you control. That creature can't be blocked this turn."
Tricks of the Trade84%
$0.16↓#18529↓0.07↓14.1 years↑
"Enchanted creature gets +2/+0 and can't be blocked."
Teleportal82%
$0.11↓#13707↓0.24↓13.9 years↑
"Target creature you control gets +1/+0 until end of turn and can't be blocked this turn."
Rikku, Resourceful Guardian80%
$0.35↓#3943↓0.36↓1.2 years↓
"Whenever you put one or more counters on a creature, until end of turn, that creature can't be blocked by creatures your opponents control."
Assassin Den78%
$0.19↓#16130↓0.502.2 years↓
"
: Put a +1/+1 counter on target creature you control. It can't be blocked this turn. Activate only as a sorcery."
Zhuge Jin, Wu Strategist78%
$76.91↑#27296↓0.29↓27.3 years↑
"
: Target creature can't be blocked this turn. Activate only during your turn, before attackers are declared."
Touch of Invisibility78%
$0.10↓#27321↓0.33↓24.9 years↑
"Target creature can't be blocked this turn."
Minamo Sightbender76%
$0.10↓#27184↓0.27↓21.6 years↑
"
,
: Target creature with power X or less can't be blocked this turn."