Spectral Guardian 
Creature — Spirit
$0.81 #30849 0.56 30.0 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 Custody90%
$1.24↑#22421↑0.5929.0 years↓
"All artifacts have shroud."
Indomitable Archangel86%
$0.37↓#7209↑0.18↓16.1 years↓
"Artifacts you control have shroud as long as you control three or more artifacts."
Fountain Watch82%
$2.46↑#15643↑0.40↓27.0 years↓
"Artifacts and enchantments you control have shroud."
Guardian Beast77%
$615.00↑#254090.4732.8 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 Resolve76%
$2.13↑#7595↑0.81↑24.0 years↓
"Creatures of the chosen type have shroud."
Smoke Bomb75%
$0.36↓#4863↑0.39↓2.3 years↓
"All creatures have shroud."
Relic Ward74%
$0.13↓#282640.00↓29.7 years
"Enchanted artifact has shroud."
Leonin Abunas73%
$1.51↑#8551↑0.35↓23.0 years↓
"Artifacts you control have hexproof."
Tortoise Formation72%
$0.13↓#24255↑0.25↓18.0 years↓
"Creatures you control gain shroud until end of turn."
Spectral Cloak70%
$5.17↑#297070.29↓32.4 years↑
"Enchanted creature has shroud as long as it's untapped."
Spiritual Asylum70%
$0.71↓#24162↑0.24↓26.7 years↓
"Creatures and lands you control have shroud."
Darksteel Forge70%
$42.68↑#1428↑1.02↑22.7 years↓
"Artifacts you control have indestructible."
Greater Auramancy70%
$20.33↑#2444↑0.83↑18.5 years↓
"Other enchantments you control have shroud."
Padeem, Consul of Innovation70%
$0.51↓#900↑0.40↓10.1 years↓
"Artifacts you control have hexproof."