Fertile Ground 
Enchantment — Aura
$0.27 #1094 0.11 28.0 years
Enchant land
Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color.
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Cards similar to Fertile Ground 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.
Dawn's Reflection97%
$0.20↓#9146↓0.33↑22.4 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional two mana in any combination of colors."
+1 more matching line
Market Festival97%
$0.22↓#10638↓0.33↑12.5 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional two mana in any combination of colors."
+1 more matching line
Verdant Haven96%
$0.05↓#12727↓0.00↓13.7 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color."
+1 more matching line
Wolfwillow Haven95%
$0.18↓#4995↓0.00↓6.7 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional ."
."+1 more matching line
Overgrowth94%
$0.25↓#3164↓0.0428.6 years
"Whenever enchanted land is tapped for mana, its controller adds an additional ."
."+1 more matching line
Shimmerwilds Growth93%
$0.26↓#7833↓0.080.7 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of the chosen color."
+1 more matching line
Wild Growth93%
$0.40↑#216↑0.1633.2 years↑
"Whenever enchanted land is tapped for mana, its controller adds an additional ."
."+1 more matching line
Blighted Burgeoning92%
$0.13↓#13055↓0.27↑3.5 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color."
+1 more matching line
Glittering Frost92%
$0.25↓#10653↓0.25↑5.7 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color."
+1 more matching line
Trace of Abundance92%
$0.95↑#7041↓0.1117.5 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color."
+1 more matching line
Utopia Sprawl90%
$1.31↑#350↑0.1720.5 years↓
"Whenever enchanted Forest is tapped for mana, its controller adds an additional one mana of the chosen color."
+1 more matching line
Buried in the Garden85%
$0.13↓#7050↓0.192.7 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color."
+1 more matching line
Zhur-Taa Ancient84%
$0.33↑#8336↓0.00↓13.5 years↓
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Vernal Bloom83%
$4.27↑#10957↓0.35↑28.0 years
"Whenever a Forest is tapped for mana, its controller adds an additional ."
."
Extraplanar Lens83%
$12.94↑#1695↓0.1823.0 years↓
"Whenever a land with the same name as the exiled card is tapped for mana, its controller adds one mana of any type that land produced."
Gauntlet of Might82%
$600.00↑#12421↓0.1833.2 years↑
"Whenever a Mountain is tapped for mana, its controller adds an additional 
."
."
Nikya of the Old Ways82%
$0.33↑#10750↓0.24↑7.7 years↓
"Whenever you tap a land for mana, add one mana of any type that land produced."
Elvish Guidance80%
$0.98↑#6557↓0.42↑24.0 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional for each Elf on the battlefield."
for each Elf on the battlefield."+1 more matching line
Gauntlet of Power80%
$3.80↑#2627↓0.2020.0 years↓
"Whenever a basic land is tapped for mana of the chosen color, its controller adds an additional one mana of that color."
Groundchuck & Dirtbag78%
$0.41↑#8597↓0.38↑0.6 years↓
"Whenever you tap a land for mana, add ."
."