Spectral Guardian 
Creature — Spirit
$0.75 #30507 0.07 29.9 years
As long as this creature is untapped, noncreature artifacts have shroud. (They can't be the targets of spells or abilities.)
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Cards similar to Spectral Guardian 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.
Hanna's Custody88%
$1.25↑#22024↑0.93↑28.9 years↓
"All artifacts have shroud."
Fountain Watch86%
$2.28↑#15406↑0.84↑26.9 years↓
"Artifacts and enchantments you control have shroud."
Indomitable Archangel83%
$0.38↓#6981↑0.0015.9 years↓
"Artifacts you control have shroud as long as you control three or more artifacts."
Guardian Beast82%
$615.00↑#251110.82↑32.7 years↑
"As long as this creature is untapped, noncreature artifacts you control can't be enchanted, they have indestructible, and other players can't gain control of them. This effect doesn't remove Auras already attached to those artifacts."
Steely Resolve73%
$1.84↑#7601↑0.50↑23.9 years↓
"Creatures of the chosen type have shroud."
Smoke Bomb72%
$0.36↓#4718↑0.40↑2.2 years↓
"All creatures have shroud."
Relic Ward71%
$0.11↓#279750.0629.6 years
"Enchanted artifact has shroud."
Leonin Abunas70%
$1.41↑#8425↑0.47↑22.9 years↓
"Artifacts you control have hexproof."
Darksteel Forge70%
$41.16↑#1422↑0.97↑22.6 years↓
"Artifacts you control have indestructible."