Shimmerwilds Growth 

Enchantment — Aura
Enchant land
As this Aura enters, choose a color.
Enchanted land is the chosen color.
Whenever enchanted land is tapped for mana, its controller adds an additional one mana of the chosen color.
click a line to search just that ability, click more to combine them
Cards that do something similar 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.
Verdant Haven 85%
$0.06#12297
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color."
+1 more matching line
Blighted Burgeoning 85%
$0.14#12537
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color."
+2 more matching lines
Trace of Abundance 85%
$0.92#7016
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color."
+2 more matching lines
Fertile Ground 85%
$0.35#1041
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color."
+1 more matching line
Glittering Frost 85%
$0.31#10222
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color."
+2 more matching lines
Buried in the Garden 85%
$0.29#6842
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color."
+1 more matching line
Gauntlet of Power 81%
$4.26#2501
"Whenever a basic land is tapped for mana of the chosen color, its controller adds an additional one mana of that color."
+1 more matching line