Manabarbs 
Enchantment
$4.32 #2215 1.24 33.1 years
Whenever a player taps a land for mana, this enchantment deals 1 damage to that player.
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Cards similar to Manabarbs expected a card that isn't here?
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Overabundance94%
$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."
Scald90%
$0.29↓#25397↓0.20↓27.9 years↓
"Whenever a player taps an Island for mana, this enchantment deals 1 damage to that player."
Burning Earth89%
$2.57↓#6064↓1.00↓13.1 years↓
"Whenever a player taps a nonbasic land for mana, this enchantment deals 1 damage to that player."
Zhur-Taa Druid88%
$0.18↓#4187↓0.24↓13.3 years↓
"Whenever you tap this creature for mana, it deals 1 damage to each opponent."
Spireside Infiltrator87%
$0.10↓#22746↓0.06↓9.9 years↓
"Whenever this creature becomes tapped, it deals 1 damage to each opponent."
Spellshock84%
$2.98↓#5451↓1.3328.2 years↓
"Whenever a player casts a spell, this enchantment deals 2 damage to that player."
Dingus Egg84%
$0.44↓#15542↓0.12↓33.1 years
"Whenever a land is put into a graveyard from the battlefield, this artifact deals 2 damage to that land's controller."
Sulfuric Vortex83%
$0.88↓#2762↓0.63↓23.3 years↓
"At the beginning of each player's upkeep, this enchantment deals 2 damage to that player."
Copper Tablet82%
$56.45↑#15363↓0.11↓33.1 years
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Burning-Tree Shaman81%
$0.37↓#22268↓0.38↓20.6 years↓
"Whenever a player activates an ability that isn't a mana ability, this creature deals 1 damage to that player."
Pyrostatic Pillar81%
$2.77↓#12176↓0.62↓23.3 years↓
"Whenever a player casts a spell with mana value 3 or less, this enchantment deals 2 damage to that player."
Tunneling Geopede80%
$0.29↓#4909↓0.14↓10.9 years↓
"Whenever a land you control enters, this creature deals 1 damage to each opponent."
Sabotender80%
$0.26↓#24260.32↓1.2 years↓
"Whenever a land you control enters, this creature deals 1 damage to each opponent."
Spitfire Lagac80%
$0.20↓#3917↓0.15↓5.9 years↓
"Whenever a land you control enters, this creature deals 1 damage to each opponent."
Barbflare Gremlin79%
$0.35↓#7890↓0.33↓1.9 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."
Hawkeye's Bow79%
$0.25↓#12136↓0.00↓0.2 years↓
"Whenever equipped creature becomes tapped, it deals 1 damage to each opponent."
Panicked Altisaur79%
$0.18↓#13639↓0.07↓2.8 years↓
"
: This creature deals 2 damage to each opponent."
: This creature deals 2 damage to each opponent."
Lasting Tarfire78%
$0.25↓#6536↓0.00↓0.6 years↓
"At the beginning of each end step, if you put a counter on a creature this turn, this enchantment deals 2 damage to each opponent."
Aether Sting76%
$0.43↓#14933↓0.12↓27.2 years↓
"Whenever an opponent casts a creature spell, this enchantment deals 1 damage to that player."
Power Surge76%
$1.11↓#11497↓0.43↓33.1 years
"At the beginning of each player's upkeep, this enchantment deals X damage to that player, where X is the number of untapped lands they controlled at the beginning of this turn."