Killer's Mask 

Artifact — Equipment
$0.17 #19551 0.19 1.9 years
When this Equipment enters, manifest dread, then attach this Equipment to that creature. (Look at the top two cards of your library. Put one onto the battlefield face down as a 2/2 creature and the other into your graveyard. Turn it face up any time for its mana cost if it's a creature card.)
Equipped creature has menace.
Equip 
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Cards similar to Killer's Mask 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.
Conductive Machete97%
$0.10↓#181780.151.9 years
"When this Equipment enters, manifest dread, then attach this Equipment to that creature."
Draugr's Helm96%
$0.20↑#24449↓0.195.6 years↑
"Equipped creature gets +2/+2 and has menace."
+1 more matching line
Cursed Windbreaker88%
$0.15↓#160510.04↓1.9 years
"When this Equipment enters, manifest dread, then attach this Equipment to that creature."
Dissection Tools86%
$0.30↑#7633↑0.111.9 years
"When this Equipment enters, manifest dread, then attach this Equipment to that creature."
Ancestral Blade84%
$0.08↓#12681↑0.00↓7.2 years↑
"When this Equipment enters, create a 1/1 white Soldier creature token, then attach this Equipment to it."
+1 more matching line
Dredging Claw83%
$0.12↓#231990.06↓3.8 years↑
"Equipped creature gets +1/+0 and has menace."
+1 more matching line
Phantom Blade82%
$0.30↑#10199↑0.00↓2.2 years
"Equipped creature gets +1/+1 and has menace."
+1 more matching line