Gauntlet of Power 
Artifact
$3.22 #2556 0.43 19.9 years
As this artifact enters, choose a color.
Creatures of the chosen color get +1/+1.
Whenever a basic land is tapped for mana of the chosen color, its controller adds an additional one mana of that color.
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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.
Caged Sun96%
$3.73↑#917↑0.64↑15.3 years↓
"Creatures you control of the chosen color get +1/+1."
+2 more matching lines
Hall of Triumph90%
$0.44↓#11172↓0.29↓12.4 years↓
"Creatures you control of the chosen color get +1/+1."
+1 more matching line
Heraldic Banner88%
$0.31↓#861↑0.18↓6.9 years↓
"Creatures you control of the chosen color get +1/+0."
+2 more matching lines
Gauntlet of Might85%
$582.49↑#12361↓0.86↑33.1 years↑
"Whenever a Mountain is tapped for mana, its controller adds an additional 
."
."+1 more matching line
Lavaleaper84%
$0.31↓#7518↓0.00↓0.6 years↓
"Whenever a player taps a basic land for mana, that player adds one mana of any type that land produced."
Market Festival82%
$0.17↓#10468↓0.4612.3 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional two mana in any combination of colors."
Dawn's Reflection82%
$0.22↓#8972↓0.22↓22.3 years↑
"Whenever enchanted land is tapped for mana, its controller adds an additional two mana in any combination of colors."
Paradise Plume82%
$0.20↓#10973↓0.00↓19.9 years
"As this artifact enters, choose a color."
+1 more matching line
Prism Ring82%
$0.40↓#8740↓0.00↓11.1 years↓
"As this artifact enters, choose a color."
Mirari's Wake82%
$5.74↑#697↑0.66↑24.3 years↑
"Whenever you tap a land for mana, add one mana of any type that land produced."
+1 more matching line
Zhur-Taa Ancient82%
$0.40↓#8250↓0.12↓13.3 years↓
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Dictate of Karametra82%
$0.88↓#6154↓0.12↓12.3 years↓
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Vernal Bloom82%
$4.17↑#10748↓0.31↓27.9 years↑
"Whenever a Forest is tapped for mana, its controller adds an additional 
."
."
Verdant Haven81%
$0.05↓#12547↓0.00↓13.6 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color."
Diamond Mare80%
$0.15↓#7494↓0.29↓8.1 years↓
"As this creature enters, choose a color."
Fertile Ground80%
$0.27↓#1065↑0.15↓27.9 years↑
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color."
Blighted Burgeoning79%
$0.14↓#12818↓0.00↓3.4 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color."
Heartbeat of Spring79%
$2.22↓#4250↓0.54↑21.9 years↑
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Mana Flare79%
$0.47↓#3297↓0.58↑33.1 years↑
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Wolfwillow Haven79%
$0.24↓#4907↓0.14↓6.6 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional ."
."