Quag Sickness 
Enchantment — Aura
$0.04 #20816 0.33 16.3 years
Enchant creature
Enchanted creature gets -1/-1 for each Swamp you control.
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Defile93%
$1.21↑#984↑0.257.4 years↓
"Target creature gets -1/-1 until end of turn for each Swamp you control."
Mutilate92%
$0.24↑#2395↑0.3924.7 years↑
"All creatures get -1/-1 until end of turn for each Swamp you control."
Exotic Curse82%
$0.13↑#28999↓0.2826.0 years↑
"Enchanted creature gets -1/-1 for each basic land type among lands you control."
Death's Approach78%
$0.16↑#214660.11↓13.7 years↓
"Enchanted creature gets -X/-X, where X is the number of creature cards in its controller's graveyard."
Liliana of the Dark Realms77%
$8.42↑#2146↑0.3914.3 years↓
"−3: Target creature gets +X/+X or -X/-X until end of turn, where X is the number of Swamps you control."
Crystalline Armor74%
$0.31↑#8827↑0.20↓0.9 years↓
"Enchant creature"
Ironclaw Curse74%
$0.33↑#31493↓0.19↓31.1 years↑
"Enchanted creature gets -0/-1."
+1 more matching line
Desert's Due74%
$0.11↑#243790.11↓2.5 years↓
"Target creature gets -2/-2 until end of turn. It gets an additional -1/-1 until end of turn for each Desert you control."
Kagemaro's Clutch74%
$0.21↑#30694↓0.00↓21.4 years↑
"Enchanted creature gets -X/-X, where X is the number of cards in your hand."
Failed Conversion72%
$0.07↑#26295↓0.15↓3.5 years↓
"Enchanted creature gets -4/-4."
Mire's Grasp72%
$0.14↑#212890.416.7 years↓
"Enchanted creature gets -3/-3."
Priest of the Haunted Edge72%
$0.14↑#14946↑0.00↓5.7 years↓
"
, Sacrifice this creature: Target creature gets -X/-X until end of turn, where X is the number of snow lands you control. Activate only as a sorcery."
, Sacrifice this creature: Target creature gets -X/-X until end of turn, where X is the number of snow lands you control. Activate only as a sorcery."
Weight of the Underworld72%
$0.03↓#27795↓0.00↓12.7 years↓
"Enchanted creature gets -3/-2."
Dead Weight72%
$0.06↑#14610↑0.15↓15.1 years↓
"Enchanted creature gets -2/-2."
+1 more matching line
Debilitating Injury72%
$0.04#26868↓0.04↓12.1 years↓
"Enchanted creature gets -2/-2."
Inner Demon72%
$0.23↑#178860.11↓8.4 years↓
"Enchant creature"
Stab Wound71%
$0.12↑#9171↑0.06↓14.0 years↓
"Enchanted creature gets -2/-2."
Drag Down71%
$0.04#29166↓0.07↓17.7 years↑
"Target creature gets -1/-1 until end of turn for each basic land type among lands you control."
Claws of Valakut70%
$0.21↑#10592↑0.06↓16.7 years
"Enchant creature"
World-Weary70%
$0.08↑#236620.00↓5.3 years↓
"Enchanted creature gets -4/-4."