Karma 
Enchantment
$0.18 #19292 0.75 33.2 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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Cold Snap80%
$0.19↑#31571↓0.21↓31.4 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."
Power Surge79%
$1.09↑#11693↑0.17↓33.2 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."
Mask of Intolerance78%
$0.30↑#30479↓0.31↓25.4 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."
Stern Judge78%
$0.25↑#25377↓0.29↓24.7 years↓
"
: Each player loses 1 life for each Swamp they control."
: Each player loses 1 life for each Swamp they control."
Thelon's Chant76%
$0.17↓#29547↓0.53↓32.0 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."
Monsoon75%
$0.95↑#27421↓0.62↓31.4 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."
Rumbling Slum75%
$0.25↑#27068↓0.06↓20.7 years↓
"At the beginning of your upkeep, this creature deals 1 damage to each player."
Acidic Soil74%
$0.59↑#8133↑0.33↓28.0 years↓
"this card deals damage to each player equal to the number of lands they control."
Citadel of Pain74%
$3.67↑#6850↑0.61↓26.4 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."
Primal Order72%
$1.90↑#159930.6831.1 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."
Copper Tablet72%
$56.19↑#158870.25↓33.2 years
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Price of Progress72%
$4.47↑#2857↑0.41↓28.3 years↓
"this card deals damage to each player equal to twice the number of nonbasic lands that player controls."
Collapsing Borders70%
$0.36↑#24222↓0.38↓26.0 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."
Flame Rift70%
$0.33↑#4030↑0.28↓26.7 years↓
"this card deals 4 damage to each player."
Royal Decree70%
$0.73↑#26444↓0.45↓30.4 years↓
"Whenever a Swamp, Mountain, black permanent, or red permanent becomes tapped, this enchantment deals 1 damage to that permanent's controller."
Crusading Knight70%
$1.05↑#23423↓0.21↓26.0 years↓
"This creature gets +1/+1 for each Swamp your opponents control."