Water Wurm 
Creature — Wurm
$0.22 #31322 0.80 32.1 years
This creature gets +0/+1 as long as an opponent controls an Island.
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Wu Admiral100%
$2.33↑#310980.21↓27.3 years↓
"This creature gets +1/+1 as long as an opponent controls an Island."
Tide Shaper96%
$0.30↑#11417↑0.00↓5.2 years↓
"This creature gets +1/+1 as long as an opponent controls an Island."
Rushwood Legate84%
$0.23↑#297780.00↓26.9 years↓
"If an opponent controls an Island and you control a Forest, you may cast this spell without paying its mana cost."
Typhoon82%
$17.34↑#297400.22↓32.3 years
"this card deals damage to each opponent equal to the number of Islands that player controls."
Inkwell Leviathan82%
$0.48↑#4991↑0.32↓17.6 years↓
"Islandwalk"
Mogg Salvage80%
$0.25↑#6601↑0.23↓26.6 years↓
"If an opponent controls an Island and you control a Mountain, you may cast this spell without paying its mana cost."
Thoughtleech79%
$0.21↓#24827↑0.33↓31.3 years
"Whenever an Island an opponent controls becomes tapped, you may gain 1 life."
Carpet of Flowers78%
$1.76↑#1262↑0.60↓27.9 years↓
"At the beginning of each of your main phases, if you haven't added mana with this ability this turn, you may add X mana of any one color, where X is the number of Islands target opponent controls."
Monsoon76%
$0.96↑#270220.60↓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."
Scald75%
$0.29↑#253970.20↓27.9 years↓
"Whenever a player taps an Island for mana, this enchantment deals 1 damage to that player."
Choke74%
$0.92↑#17272↑1.66↑28.9 years↓
"Islands don't untap during their controllers' untap steps."
Seasinger72%
$0.24↑#21172↑0.11↓31.8 years
"When you control no Islands, sacrifice this creature."
Curse of Marit Lage72%
$2.64↑#256051.06↑31.3 years
"Islands don't untap during their controllers' untap steps."
Tsunami71%
$0.36↑#19035↑1.64↑33.1 years
"Destroy all Islands."
Boil71%
$0.61↑#14868↑1.87↑28.9 years↓
"Destroy all Islands."
Boiling Seas71%
$5.11↑#20180↑1.76↑29.3 years↓
"Destroy all Islands."
Cryoclasm70%
$0.10↓#277350.49↓20.1 years↓
"Destroy target Plains or Island. this card deals 3 damage to that land's controller."
Marshdrinker Giant70%
$0.12↓#301900.33↓18.1 years↓
"When this creature enters, destroy target Island or Swamp an opponent controls."