Drought 
Enchantment
$0.32 #27732 1.08 31.3 years
At the beginning of your upkeep, sacrifice this enchantment unless you pay .
.Spells cost an additional "Sacrifice a Swamp" to cast for each black mana symbol in their mana costs.
Activated abilities cost an additional "Sacrifice a Swamp" to activate for each black mana symbol in their activation costs.
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Thelon's Chant78%
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"At the beginning of your upkeep, sacrifice this enchantment unless you pay 
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"At the beginning of your upkeep, sacrifice this enchantment unless you pay ."
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$0.54↑#291150.69↓31.3 years
"At the beginning of your upkeep, sacrifice this enchantment unless you pay 
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Nature's Wrath76%
$2.33↑#237901.0930.2 years↓
"Whenever a player puts a Swamp or black permanent onto the battlefield, that player sacrifices a Swamp or black permanent of their choice."
+1 more matching line
Conversion76%
$0.24↓#265561.1833.1 years↑
"At the beginning of your upkeep, sacrifice this enchantment unless you pay ."
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School of Piranha76%
$0.15↓#301880.10↓28.2 years↓
"At the beginning of your upkeep, sacrifice this creature unless you pay ."
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Whipstitched Zombie76%
$0.09↓#316810.27↓26.3 years↓
"At the beginning of your upkeep, sacrifice this creature unless you pay 
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Wild Leotau76%
$0.08↓#316860.50↓17.6 years↓
"At the beginning of your upkeep, sacrifice this creature unless you pay ."
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Hungry Mist76%
$0.09↓#304810.22↓30.9 years
"At the beginning of your upkeep, sacrifice this creature unless you pay ."
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Darba76%
$0.12↓#313420.50↓26.3 years↓
"At the beginning of your upkeep, sacrifice this creature unless you pay ."
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Breeding Pit75%
$0.23↓#221900.27↓31.8 years
"At the beginning of your upkeep, sacrifice this enchantment unless you pay ."
."
Pit Raptor75%
$0.20↓#313960.00↓26.3 years↓
"At the beginning of your upkeep, sacrifice this creature unless you pay ."
."
Junún Efreet75%
$0.14↓#317570.00↓32.7 years↑
"At the beginning of your upkeep, sacrifice this creature unless you pay ."
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Royal Decree75%
$0.74↑#260860.21↓30.2 years↓
"Cumulative upkeep "
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Molting Harpy74%
$0.15↓#308750.53↓26.9 years↓
"At the beginning of your upkeep, sacrifice this creature unless you pay ."
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Spindrift Drake74%
$0.11↓#312200.00↓28.5 years↓
"At the beginning of your upkeep, sacrifice this creature unless you pay ."
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Krosan Cloudscraper74%
$0.23↓#13591↑0.25↓23.6 years↓
"At the beginning of your upkeep, sacrifice this creature unless you pay ."
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Stasis73%
$9.80↑#7794↑3.06↑33.1 years↑
"At the beginning of your upkeep, sacrifice this enchantment unless you pay ."
."
Palladia-Mors72%
$0.65↑#255780.27↓32.3 years↑
"At the beginning of your upkeep, sacrifice this card unless you pay 
."
."