Quag Sickness 
Enchantment — Aura
$0.04 #20488 0.30 16.1 years
Enchant creature
Enchanted creature gets -1/-1 for each Swamp you control.
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Mutilate92%
$1.25↑#2397↑0.3624.6 years↑
"All creatures get -1/-1 until end of turn for each Swamp you control."
Defile91%
$1.56↑#987↑0.267.2 years↓
"Target creature gets -1/-1 until end of turn for each Swamp you control."
Exotic Curse84%
$0.12↑#28755↓0.2825.9 years↑
"Enchanted creature gets -1/-1 for each basic land type among lands you control."
Death's Approach80%
$0.09↑#211000.3813.6 years↓
"Enchanted creature gets -X/-X, where X is the number of creature cards in its controller's graveyard."
+1 more matching line
Liliana of the Dark Realms76%
$7.23↑#2140↑0.3214.1 years↓
"−3: Target creature gets +X/+X or -X/-X until end of turn, where X is the number of Swamps you control."
Ironclaw Curse75%
$0.26↑#31183↓0.45↑30.9 years↑
"Enchanted creature gets -0/-1."
+1 more matching line
Kagemaro's Clutch74%
$0.21↑#30432↓0.00↓21.3 years↑
"Enchanted creature gets -X/-X, where X is the number of cards in your hand."
+1 more matching line
Clinging Darkness73%
$0.14↑#28078↓0.13↓20.9 years↑
"Enchanted creature gets -4/-1."
Mire's Grasp73%
$0.14↑#209540.00↓6.6 years↓
"Enchanted creature gets -3/-3."
+1 more matching line
Failed Conversion72%
$0.07↑#25834↓0.06↓3.4 years↓
"Enchanted creature gets -4/-4."
Weight of the Underworld72%
$0.03↓#27625↓0.40↑12.6 years↓
"Enchanted creature gets -3/-2."
Dead Weight72%
$0.05↑#14308↑0.43↑14.9 years↓
"Enchanted creature gets -2/-2."
+1 more matching line
Debilitating Injury72%
$0.04#26646↓0.2711.9 years↓
"Enchanted creature gets -2/-2."
+1 more matching line
Feebleness72%
$0.10↑#28220↓0.63↑19.9 years↑
"Enchanted creature gets -2/-1."
+1 more matching line
Weakness72%
$0.05↑#27665↓0.00↓33.1 years↑
"Enchanted creature gets -2/-1."
+1 more matching line
Drag Down72%
$0.04#28940↓0.2917.6 years↑
"Target creature gets -1/-1 until end of turn for each basic land type among lands you control."
Stab Wound72%
$0.10↑#8978↑0.2713.9 years↓
"Enchanted creature gets -2/-2."
+1 more matching line
Gwyllion Hedge-Mage72%
$0.10↑#29019↓0.53↑18.1 years↑
"When this creature enters, if you control two or more Swamps, you may put a -1/-1 counter on target creature."
World-Weary71%
$0.10↑#231730.00↓5.2 years↓
"Enchanted creature gets -4/-4."
+1 more matching line
Ancestral Vengeance71%
$0.04#225970.43↑11.6 years↓
"Enchanted creature gets -1/-1."