Barbflare Gremlin 
Creature — Gremlin
$0.35 #7890 0.33 1.9 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%
$5.52↑#9990↓0.44↑25.9 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%
$0.40↑#82500.12↓13.3 years↑
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Dictate of Karametra86%
$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 Bloom85%
$4.17↑#10748↓0.3127.9 years↑
"Whenever a Forest is tapped for mana, its controller adds an additional 
."
."
Heartbeat of Spring84%
$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 Flare84%
$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 Haven82%
$0.24↓#4907↑0.14↓6.6 years↑
"Whenever enchanted land is tapped for mana, its controller adds an additional ."
."
Market Festival82%
$0.17↓#10468↓0.46↑12.3 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↓#89720.22↓22.3 years↑
"Whenever enchanted land is tapped for mana, its controller adds an additional two mana in any combination of colors."
Overgrowth81%
$0.24↓#3075↑0.22↓28.5 years↑
"Whenever enchanted land is tapped for mana, its controller adds an additional ."
."
Gauntlet of Might80%
$582.49↑#12361↓0.86↑33.1 years↑
"Whenever a Mountain is tapped for mana, its controller adds an additional ."
."
Wild Growth80%
$0.35#212↑0.16↓33.1 years↑
"Whenever enchanted land is tapped for mana, its controller adds an additional ."
."
Manabarbs79%
$4.32↑#2215↑1.24↑33.1 years↑
"Whenever a player taps a land for mana, this enchantment deals 1 damage to that player."
Nikya of the Old Ways78%
$0.37↑#10535↓0.50↑7.6 years↑
"Whenever you tap a land for mana, add one mana of any type that land produced."
Verdant Haven78%
$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."
Extraplanar Lens78%
$12.48↑#1709↑0.3322.9 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."
Lavaleaper77%
$0.31↓#75180.00↓0.6 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
Fertile Ground77%
$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 Burgeoning76%
$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."
Shimmerwilds Growth76%
$0.29↓#83590.00↓0.6 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of the chosen color."