Caged Sun 
Artifact
$3.73 #917 0.64 15.3 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%
$0.44↓#11172↓0.29↓12.4 years↓
"Creatures you control of the chosen color get +1/+1."
+1 more matching line
Gauntlet of Power96%
$3.22↓#2556↓0.43↓19.9 years↑
"Creatures of the chosen color get +1/+1."
+2 more matching lines
Heraldic Banner94%
$0.31↓#8610.18↓6.9 years↓
"Creatures you control of the chosen color get +1/+0."
+2 more matching lines
Mirari's Wake90%
$5.74↑#697↑0.6624.3 years↑
"Creatures you control get +1/+1."
+1 more matching line
Paradise Plume86%
$0.20↓#10973↓0.00↓19.9 years↑
"As this artifact enters, choose a color."
+1 more matching line
Prism Ring86%
$0.40↓#8740↓0.00↓11.1 years↓
"As this artifact enters, choose a color."
Diamond Mare84%
$0.15↓#7494↓0.29↓8.1 years↓
"As this creature enters, choose a color."
Forsaken Monument82%
$6.19↑#8980.77↑5.9 years↓
"Colorless creatures you control get +2/+2."
Lurebound Scarecrow82%
$0.32↓#21131↓0.00↓18.3 years↑
"As this creature enters, choose a color."
Jeweled Torque81%
$0.22↓#30264↓0.13↓26.9 years↑
"As this artifact enters, choose a color."
Benalish Marshal80%
$0.48↓#7850↓0.44↓8.4 years↓
"Other creatures you control get +1/+1."
Kongming, "Sleeping Dragon"80%
$0.18↓#17673↓0.42↓27.3 years↑
"Other creatures you control get +1/+1."
Gaea's Anthem80%
$0.25↓#8921↓0.00↓19.6 years↑
"Creatures you control get +1/+1."
Anthem of Champions80%
$0.25↓#6356↓0.14↓1.8 years↓
"Creatures you control get +1/+1."
Glorious Anthem80%
$0.38↓#7157↓0.25↓27.9 years↑
"Creatures you control get +1/+1."
Diamond Knight80%
$0.26↓#15007↓0.08↓7.2 years↓
"As this creature enters, choose a color."
Dictate of Heliod80%
$0.37↓#6913↓0.50↓12.3 years↓
"Creatures you control get +2/+2."
Collective Blessing80%
$0.32↓#8078↓0.15↓13.9 years↓
"Creatures you control get +3/+3."
Throne of Eldraine80%
$28.44↑#8780.25↓3.0 years↓
"As this card enters, choose a color."
+1 more matching line
Seal of the Guildpact78%
$0.37↓#12375↓0.29↓10.8 years↓
"As this artifact enters, choose two colors."