Thing from the Deep 
Creature — Leviathan
$0.64 #29608 0.27 29.3 years
Whenever this creature attacks, sacrifice it unless you sacrifice an Island.
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Psychic Allergy86%
$3.37↑#281580.43↑32.1 years↑
"At the beginning of your upkeep, destroy this enchantment unless you sacrifice two Islands."
Leviathan82%
$0.29↓#254400.06↓32.1 years↑
"This creature can't attack unless you sacrifice two Islands."
Kukemssa Serpent82%
$0.11↓#286200.47↑29.9 years
"When you control no Islands, sacrifice this creature."
Elder Spawn80%
$13.10↑#304130.00↓32.3 years↑
"At the beginning of your upkeep, unless you sacrifice an Island, sacrifice this creature and it deals 6 damage to you."
Cosmic Larva77%
$0.36↓#19553↑0.2922.3 years↓
"At the beginning of your upkeep, sacrifice this creature unless you sacrifice two lands."
Lesser Gargadon76%
$0.08↓#23380↑0.93↑26.3 years↓
"Whenever this creature attacks or blocks, sacrifice a land."
Walk the Aeons76%
$1.41↑#6234↑1.20↑19.9 years↓
"Buyback—Sacrifice three Islands. You may sacrifice three Islands in addition to any other costs as you cast this spell. If you do, put this card into your hand as it resolves."
Lithophage75%
$0.32↓#311020.07↓26.9 years↓
"At the beginning of your upkeep, sacrifice this creature unless you sacrifice a Mountain."
Dreamwinder74%
$0.10↓#299500.3524.9 years↓
"This creature can't attack unless defending player controls an Island."
Morkrut Necropod73%
$0.07↓#18712↑0.00↓10.4 years↓
"Whenever this creature attacks or blocks, sacrifice another creature or land."
Skeleton Ship72%
$6.19↑#20643↑0.00↓31.3 years↑
"When you control no Islands, sacrifice this card."
Coral Atoll72%
$0.63↓#5798↑0.14↓29.6 years
"When this land enters, sacrifice it unless you return an untapped Island you control to its owner's hand."
Scythe Tiger72%
$0.13↓#267070.2516.9 years↓
"When this creature enters, sacrifice it unless you sacrifice a land."
Exalted Dragon72%
$1.02↑#309730.00↓28.2 years↓
"This creature can't attack unless you sacrifice a land."
Wand of the Elements72%
$0.25↓#303640.2422.6 years↓
"
, Sacrifice an Island: Create a 2/2 blue Elemental creature token with flying."
, Sacrifice an Island: Create a 2/2 blue Elemental creature token with flying."
Bog Elemental71%
$0.25↓#303540.00↓26.3 years↓
"At the beginning of your upkeep, sacrifice this creature unless you sacrifice a land."
Polar Kraken71%
$3.78↑#256320.2031.3 years↑
"Cumulative upkeep—Sacrifice a land."
Waterspout Djinn70%
$0.10↓#313710.00↓29.6 years
"At the beginning of your upkeep, sacrifice this creature unless you return an untapped Island you control to its owner's hand."