Prowler's Helm 
Artifact — Equipment
$0.61 #3424 0.21 12.9 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%
$0.14↓#28458↓0.05↓30.9 years↑
"
,
: Target creature can't be blocked this turn except by Walls."
Invisibility92%
$0.09↓#13781↓0.45↑33.1 years↑
"Enchanted creature can't be blocked except by Walls."
Evil Eye of Orms-by-Gore89%
$0.07↓#11474↓0.47↑32.3 years↑
"This creature can't be blocked except by Walls."
Flow of Maggots82%
$1.08↑#29147↓0.2931.3 years↑
"This creature can't be blocked by non-Wall creatures."
Cloak of Invisibility81%
$0.17↓#18976↓0.38↑29.9 years↑
"Enchanted creature has phasing and can't be blocked except by Walls."
Elven Riders80%
$0.10↓#26826↓0.00↓32.3 years↑
"This creature can't be blocked except by Walls and/or creatures with flying."
Zhuge Jin, Wu Strategist76%
$76.91↑#27296↓0.2927.3 years↑
"
: Target creature can't be blocked this turn. Activate only during your turn, before attackers are declared."
Varchild's Crusader75%
$0.19↓#30826↓0.2330.2 years↑
"
: This creature can't be blocked this turn except by Walls. Sacrifice this creature at the beginning of the next end step."
Silver Shroud Costume74%
$10.36↑#1811↑0.44↑2.5 years↓
"Equipped creature can't be blocked."
+1 more matching line
Tricks of the Trade74%
$0.16↓#18529↓0.07↓14.1 years↑
"Enchanted creature gets +2/+0 and can't be blocked."
Touch of Invisibility73%
$0.10↓#27321↓0.33↑24.9 years↑
"Target creature can't be blocked this turn."