Monsoon 
Enchantment
$0.96 #27022 0.60 31.3 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.
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Cards similar to Monsoon expected a card that isn't here?
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Typhoon84%
$17.34↑#297400.22↓32.3 years↑
"this card deals damage to each opponent equal to the number of Islands that player controls."
Power Surge80%
$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."
Scald78%
$0.29↓#253970.20↓27.9 years↓
"Whenever a player taps an Island for mana, this enchantment deals 1 damage to that player."
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."
Water Wurm76%
$0.22↓#313220.80↑32.1 years
"This creature gets +0/+1 as long as an opponent controls an Island."
Wu Admiral76%
$2.33↑#310980.21↓27.3 years↓
"This creature gets +1/+1 as long as an opponent controls an Island."
Curse of Marit Lage74%
$2.64↑#256051.06↑31.3 years
"When this enchantment enters, tap all Islands."
Angel's Trumpet72%
$0.50↓#8723↑0.5227.6 years↓
"At the beginning of each player's end step, tap all untapped creatures that player controls that didn't attack this turn. This artifact deals damage to the player equal to the number of creatures tapped this way."
Mask of Intolerance72%
$0.28↓#302920.5025.3 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."
Karma71%
$0.19↓#19063↑0.6333.1 years↑
"At the beginning of each player's upkeep, this enchantment deals damage to that player equal to the number of Swamps they control."
Rumbling Slum70%
$0.25↓#266390.79↑20.6 years↓
"At the beginning of your upkeep, this creature deals 1 damage to each player."