Caged Sun 
Artifact
$3.88 #948 0.57 15.4 years
As this artifact enters, choose a color.
Creatures you control of the chosen color get +1/+1.
Whenever a land's ability causes you to add one or more mana of the chosen color, add an additional one mana of that color.
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Cards similar to Caged Sun 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.
Hall of Triumph96%
$0.37↓#11470↓0.00↓12.5 years↓
"Creatures you control of the chosen color get +1/+1."
+1 more matching line
Gauntlet of Power96%
$3.80↓#2627↓0.20↓20.0 years↑
"Creatures of the chosen color get +1/+1."
+2 more matching lines
Heraldic Banner94%
$0.26↓#8500.00↓7.0 years↓
"Creatures you control of the chosen color get +1/+0."
+2 more matching lines
Mirari's Wake90%
$3.05↓#713↑0.67↑24.4 years↑
"Creatures you control get +1/+1."
+1 more matching line
Paradise Plume86%
$0.19↓#11150↓0.00↓20.0 years↑
"As this artifact enters, choose a color."
+1 more matching line
Prism Ring86%
$0.34↓#8817↓0.22↓11.3 years↓
"As this artifact enters, choose a color."
Diamond Mare84%
$0.16↓#7424↓0.00↓8.3 years↓
"As this creature enters, choose a color."
Forsaken Monument82%
$3.10↓#8790.87↑6.1 years↓
"Colorless creatures you control get +2/+2."
Lurebound Scarecrow82%
$0.33↓#21614↓0.05↓18.5 years↑
"As this creature enters, choose a color."
Jeweled Torque81%
$0.24↓#30466↓0.25↓27.0 years↑
"As this artifact enters, choose a color."
Benalish Marshal80%
$0.45↓#7990↓0.00↓8.5 years↓
"Other creatures you control get +1/+1."
Kongming, "Sleeping Dragon"80%
$0.18↓#18103↓0.10↓27.5 years↑
"Other creatures you control get +1/+1."
Gaea's Anthem80%
$0.23↓#9089↓0.25↓19.7 years↑
"Creatures you control get +1/+1."
Anthem of Champions80%
$0.23↓#6246↓0.12↓1.9 years↓
"Creatures you control get +1/+1."
Glorious Anthem80%
$0.37↓#7321↓0.00↓28.0 years↑
"Creatures you control get +1/+1."
Diamond Knight80%
$0.30↓#15130↓0.11↓7.3 years↓
"As this creature enters, choose a color."
Collective Blessing80%
$0.30↓#8206↓0.11↓14.0 years↓
"Creatures you control get +3/+3."
Throne of Eldraine79%
$29.41↑#8970.28↓3.1 years↓
"As this card enters, choose a color."
+1 more matching line
Seal of the Guildpact78%
$0.36↓#12537↓0.14↓10.9 years↓
"As this artifact enters, choose two colors."
Tablet of the Guilds78%
$0.33↓#8966↓0.00↓14.0 years↓
"As this artifact enters, choose two colors."