Heartbeat of Spring 
Enchantment
$2.32 #4288 0.39 22.1 years
Whenever a player taps a land for mana, that player adds one mana of any type that land produced.
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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.
Mana Flare100%
$0.53↓#3340↑0.3633.2 years↑
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Dictate of Karametra99%
$0.79↓#6270↓0.12↓12.5 years↓
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Zhur-Taa Ancient94%
$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 Bloom94%
$4.27↑#10957↓0.3528.0 years↑
"Whenever a Forest is tapped for mana, its controller adds an additional ."
."
Keeper of Progenitus91%
$2.10↓#14251↓0.3118.0 years↓
"Whenever a player taps a Mountain, Forest, or Plains for mana, that player adds one mana of any type that land produced."
Lavaleaper86%
$0.30↓#7103↓0.25↓0.7 years↓
"Whenever a player taps a basic land for mana, that player adds one mana of any type that land produced."
Overabundance86%
$5.67↑#10117↓0.59↑26.0 years↑
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced, and this enchantment deals 1 damage to the player."
Nikya of the Old Ways86%
$0.33↓#10750↓0.24↓7.7 years↓
"Whenever you tap a land for mana, add one mana of any type that land produced."
Mirari's Wake82%
$3.05↑#713↑0.67↑24.4 years↑
"Whenever you tap a land for mana, add one mana of any type that land produced."
Groundchuck & Dirtbag81%
$0.41↓#8597↓0.380.6 years↓
"Whenever you tap a land for mana, add ."
."
Extraplanar Lens81%
$12.94↑#1695↑0.18↓23.0 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."
Winter's Night80%
$0.84↓#30098↓0.06↓30.4 years↑
"Whenever a player taps a snow land for mana, that player adds one mana of any type that land produced. That land doesn't untap during its controller's next untap step."
Gauntlet of Might80%
$600.00↑#12421↓0.18↓33.2 years↑
"Whenever a Mountain is tapped for mana, its controller adds an additional 
."
."
Wolfwillow Haven80%
$0.18↓#49950.00↓6.7 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional ."
."
Overgrowth80%
$0.25↓#3164↑0.04↓28.6 years↑
"Whenever enchanted land is tapped for mana, its controller adds an additional ."
."
Barbflare Gremlin79%
$0.43↓#8174↓0.20↓2.1 years↓
"Whenever a player taps a land for mana, if this creature is tapped, that player adds one mana of any type that land produced. Then that land deals 1 damage to that player."
Zendikar Resurgent79%
$2.60↑#2455↑0.3810.7 years↓
"Whenever you tap a land for mana, add one mana of any type that land produced."
Wild Growth79%
$0.40↓#216↑0.16↓33.2 years↑
"Whenever enchanted land is tapped for mana, its controller adds an additional ."
."
Market Festival79%
$0.22↓#10638↓0.3312.5 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional two mana in any combination of colors."
Dawn's Reflection79%
$0.20↓#9146↓0.3322.4 years
"Whenever enchanted land is tapped for mana, its controller adds an additional two mana in any combination of colors."