Manabarbs {3}{R}
Enchantment
Whenever a player taps a land for mana, this enchantment deals 1 damage to that player.
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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.
Burning Earth 97%
$2.83#5923
"Whenever a player taps a nonbasic land for mana, this enchantment deals 1 damage to that player."
Overabundance 87%
$5.45#9965
"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."
Barbflare Gremlin 83%
$0.28#7937
"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."
Zhur-Taa Ancient 81%
$0.35#8205
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Dictate of Karametra 81%
$0.89#6083
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Heartbeat of Spring 81%
$3.64#4242
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."