Collapsing Borders 
Enchantment
$0.36 #24222 0.38 26.0 years
Domain — 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.
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Cards similar to Collapsing Borders expected a card that isn't here?
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Mask of Intolerance88%
$0.30↓#30479↓0.3125.4 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."
Primal Order88%
$1.90↑#15993↑0.68↑31.1 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."
Power Surge86%
$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."
Copper Tablet80%
$56.19↑#15887↑0.25↓33.2 years↑
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Citadel of Pain78%
$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."
Price of Progress78%
$4.47↑#2857↑0.4128.3 years↑
"this card deals damage to each player equal to twice the number of nonbasic lands that player controls."
Flame Rift76%
$0.33↓#4030↑0.2826.7 years
"this card deals 4 damage to each player."
Furnace Punisher76%
$0.08↓#214980.10↓3.7 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."
Rumbling Slum76%
$0.25↓#270680.06↓20.7 years↓
"At the beginning of your upkeep, this creature deals 1 damage to each player."
Acidic Soil76%
$0.59↑#8133↑0.3328.0 years↑
"this card deals damage to each player equal to the number of lands they control."
Barbed Wire74%
$1.36↑#13927↑0.17↓27.0 years
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Rivalry73%
$0.36#259290.27↓27.7 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."
Cold Snap72%
$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."
Sunspine Lynx72%
$1.84↑#2932↑0.66↑2.2 years↓
"When this creature enters, it deals damage to each player equal to the number of nonbasic lands that player controls."
Razor Pendulum72%
$0.55↑#30471↓0.05↓30.0 years↑
"At the beginning of each player's end step, if that player has 5 or less life, this artifact deals 2 damage to that player."
Putrid Warrior72%
$0.09↓#29889↓0.16↓25.4 years
"• Each player gains 1 life."
Centaur Peacemaker72%
$0.13↓#257760.27↓8.0 years↓
"When this creature enters, each player gains 4 life."
Roiling Vortex71%
$1.36↑#2588↑0.54↑6.1 years↓
"At the beginning of each player's upkeep, this enchantment deals 1 damage to them."
Antagonism71%
$0.41↑#258600.18↓28.0 years↑
"At the beginning of each player's end step, this enchantment deals 2 damage to that player unless one of their opponents was dealt damage this turn."
Karma70%
$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."