Karma 
Enchantment
$0.19 #19063 0.63 33.1 years
At the beginning of each player's upkeep, this enchantment deals damage to that player equal to the number of Swamps they control.
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Power Surge82%
$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."
Stern Judge82%
$0.25↑#25116↓0.6724.6 years↓
"
: Each player loses 1 life for each Swamp they control."
: Each player loses 1 life for each Swamp they control."
Mask of Intolerance81%
$0.28↑#30292↓0.50↓25.3 years↓
"At the beginning of each player's upkeep, if there are four or more basic land types among lands that player controls, this artifact deals 3 damage to that player."
Rumbling Slum78%
$0.25↑#26639↓0.79↑20.6 years↓
"At the beginning of your upkeep, this creature deals 1 damage to each player."
Acidic Soil76%
$0.49↑#8031↑0.7327.9 years↓
"this card deals damage to each player equal to the number of lands they control."
Citadel of Pain76%
$4.17↑#6667↑1.11↑26.3 years↓
"At the beginning of each player's end step, this enchantment deals X damage to that player, where X is the number of untapped lands they control."
Cold Snap76%
$0.19#31267↓0.25↓31.3 years↓
"At the beginning of each player's upkeep, this enchantment deals damage to that player equal to the number of snow lands they control."
Copper Tablet75%
$56.45↑#153630.11↓33.1 years
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Primal Order74%
$2.09↑#157940.44↓30.9 years↓
"At the beginning of each player's upkeep, this enchantment deals damage to that player equal to the number of nonbasic lands they control."
Thelon's Chant74%
$0.18↓#29238↓0.32↓31.8 years↓
"Whenever a player puts a Swamp onto the battlefield, this enchantment deals 3 damage to that player unless the player puts a -1/-1 counter on a creature they control."
Price of Progress74%
$4.26↑#2810↑0.7028.2 years↓
"this card deals damage to each player equal to twice the number of nonbasic lands that player controls."
Flame Rift72%
$0.32↑#3984↑0.20↓26.6 years↓
"this card deals 4 damage to each player."
Collapsing Borders72%
$0.34↑#24000↓0.19↓25.9 years↓
"At the beginning of each player's upkeep, that player gains 1 life for each basic land type among lands they control. Then this enchantment deals 3 damage to that player."
Crusading Knight72%
$1.11↑#23138↓0.22↓25.9 years↓
"This creature gets +1/+1 for each Swamp your opponents control."
Rivalry72%
$0.38↑#25546↓0.32↓27.6 years↓
"At the beginning of each player's upkeep, if that player controls more lands than each other player, this enchantment deals 2 damage to them."
Monsoon71%
$0.96↑#27022↓0.6031.3 years↓
"At the beginning of each player's end step, tap all untapped Islands that player controls and this enchantment deals X damage to the player, where X is the number of Islands tapped this way."
Angry Mob71%
$0.18↓#24598↓0.44↓32.1 years
"During your turn, this card's power and toughness are each equal to 2 plus the number of Swamps your opponents control. During turns other than yours, this card's power and toughness are each 2."
Furnace Punisher70%
$0.07↓#211580.50↓3.6 years↓
"At the beginning of each player's upkeep, this creature deals 2 damage to that player unless they control two or more basic lands."
Withering Wisps70%
$0.39↑#212960.33↓31.3 years↓
"
: This enchantment deals 1 damage to each creature and each player. Activate no more times each turn than the number of snow Swamps you control."
: This enchantment deals 1 damage to each creature and each player. Activate no more times each turn than the number of snow Swamps you control."
Barbed Wire70%
$1.77↑#13458↑0.40↓26.9 years↓
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."