Barbflare Gremlin 
Creature — Gremlin
$0.43 #8174 0.20 2.1 years
First strike, haste
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.
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Cards similar to Barbflare Gremlin 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.
Overabundance90%
$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."
Zhur-Taa Ancient86%
$0.33↓#83360.00↓13.5 years↑
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Extraplanar Lens82%
$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."
Wolfwillow Haven82%
$0.18↓#4995↑0.00↓6.7 years↑
"Whenever enchanted land is tapped for mana, its controller adds an additional 
."
."
Market Festival82%
$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."
Dawn's Reflection82%
$0.20↓#91460.33↑22.4 years↑
"Whenever enchanted land is tapped for mana, its controller adds an additional two mana in any combination of colors."
Overgrowth81%
$0.25↓#3164↑0.04↓28.6 years↑
"Whenever enchanted land is tapped for mana, its controller adds an additional ."
."
Vernal Bloom80%
$4.27↑#10957↓0.35↑28.0 years↑
"Whenever a Forest is tapped for mana, its controller adds an additional ."
."
Wild Growth80%
$0.40↓#216↑0.1633.2 years↑
"Whenever enchanted land is tapped for mana, its controller adds an additional ."
."
Dictate of Karametra80%
$0.79↑#6270↑0.1212.5 years↑
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Gauntlet of Might80%
$600.00↑#12421↓0.1833.2 years↑
"Whenever a Mountain is tapped for mana, its controller adds an additional ."
."
Mana Flare79%
$0.53↑#3340↑0.36↑33.2 years↑
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Heartbeat of Spring79%
$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."
Manabarbs79%
$4.42↑#2300↑1.34↑33.2 years↑
"Whenever a player taps a land for mana, this enchantment deals 1 damage to that player."
Nikya of the Old Ways78%
$0.33↓#10750↓0.247.7 years↑
"Whenever you tap a land for mana, add one mana of any type that land produced."
Verdant Haven78%
$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."
Fertile Ground77%
$0.27↓#1094↑0.1128.0 years↑
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color."
Blighted Burgeoning76%
$0.13↓#13055↓0.273.5 years↑
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color."
Lavaleaper76%
$0.30↓#71030.250.7 years↓
"Whenever a player taps a basic land for mana, that player adds one mana of any type that land produced."
+1 more matching line
Shimmerwilds Growth76%
$0.26↓#78330.08↓0.7 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of the chosen color."