Prowler's Helm 
Artifact — Equipment
$0.57 #3507 0.27 13.1 years
Equipped creature can't be blocked except by Walls.
Equip 
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Cards similar to Prowler's Helm 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.
Joven's Tools92%
$0.16↓#28666↓0.44↑31.1 years↑
"
,
: Target creature can't be blocked this turn except by Walls."
Invisibility92%
$0.10↓#13907↓0.05↓33.2 years↑
"Enchanted creature can't be blocked except by Walls."
Evil Eye of Orms-by-Gore89%
$0.08↓#11649↓0.2132.4 years↑
"This creature can't be blocked except by Walls."
Flow of Maggots82%
$1.20↑#29594↓0.00↓31.4 years↑
"This creature can't be blocked by non-Wall creatures."
Cloak of Invisibility81%
$0.22↓#19181↓0.13↓30.0 years↑
"Enchanted creature has phasing and can't be blocked except by Walls."
Elven Riders80%
$0.12↓#27153↓0.07↓32.4 years↑
"This creature can't be blocked except by Walls and/or creatures with flying."
Hot Soup76%
$0.37↓#10091↓0.00↓12.3 years
"Equipped creature can't be blocked."
+1 more matching line
Zhuge Jin, Wu Strategist76%
$76.91↑#27573↓0.1827.5 years↑
"
: Target creature can't be blocked this turn. Activate only during your turn, before attackers are declared."
Varchild's Crusader75%
$0.21↓#31130↓0.00↓30.4 years↑
"
: This creature can't be blocked this turn except by Walls. Sacrifice this creature at the beginning of the next end step."
Tricks of the Trade74%
$0.18↓#18776↓0.12↓14.3 years↑
"Enchanted creature gets +2/+0 and can't be blocked."