Contamination 

Enchantment
$4.97 #7946 1.69 28.0 years
At the beginning of your upkeep, sacrifice this enchantment unless you sacrifice a creature.
If a land is tapped for mana, it produces
instead of any other type and amount.
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Infernal Darkness98%
$6.56↑#18855↓1.40↓31.4 years↑
"If a land is tapped for mana, it produces
instead of any other type."
Ritual of Subdual94%
$1.41↓#26646↓1.30↓31.4 years↑
"If a land is tapped for mana, it produces colorless mana instead of any other type."
Damping Sphere82%
$0.64↓#4993↑1.36↓8.5 years↓
"If a land is tapped for two or more mana, it produces
instead of any other type and amount."
Pale Moon82%
$0.47↓#27922↓0.72↓26.7 years↓
"Until end of turn, if a player taps a nonbasic land for mana, it produces colorless mana instead of any other type."
Demonic Appetite80%
$0.11↓#25678↓0.14↓16.5 years↓
"At the beginning of your upkeep, sacrifice a creature."
Abhorrent Overlord78%
$0.44↓#5960↑0.00↓13.1 years↓
"At the beginning of your upkeep, sacrifice a creature."
Oni Possession78%
$0.16↓#26922↓0.28↓22.1 years↓
"At the beginning of your upkeep, sacrifice a creature."
Demonic Taskmaster78%
$0.21↓#9646↓0.17↓14.5 years↓
"At the beginning of your upkeep, sacrifice a creature other than this creature."
Devouring Strossus76%
$0.81↓#21357↓0.28↓26.0 years↓
"At the beginning of your upkeep, sacrifice a creature."
Smothering Abomination76%
$0.33↓#3877↑0.24↓11.0 years↓
"At the beginning of your upkeep, sacrifice a creature."
Daemogoth Woe-Eater74%
$0.31↓#75990.27↓5.5 years↓
"At the beginning of your upkeep, sacrifice a creature."
Eldrazi Monument74%
$9.01↑#1466↑0.71↓17.0 years↓
"At the beginning of your upkeep, sacrifice a creature. If you can't, sacrifice this artifact."
Apocalypse Demon74%
$0.25↓#15742↓0.00↓9.3 years↓
"At the beginning of your upkeep, tap this creature unless you sacrifice another creature."
Lord of the Pit74%
$0.40↓#13167↓0.07↓33.2 years↑
"At the beginning of your upkeep, sacrifice a creature other than this creature. If you can't, this creature deals 7 damage to you."
Pulse of Llanowar72%
$0.28↓#26606↓0.29↓26.0 years↓
"If a basic land you control is tapped for mana, it produces mana of a color of your choice instead of any other type."
Liege of the Pit72%
$0.75↓#16957↓0.00↓20.0 years↓
"At the beginning of your upkeep, sacrifice a creature other than this creature. If you can't, this creature deals 7 damage to you."
Endless Wurm72%
$0.29↓#27629↓0.33↓28.0 years
"At the beginning of your upkeep, sacrifice this creature unless you sacrifice an enchantment."
Reality Twist72%
$2.37↓#27172↓1.20↓31.4 years↑
"If tapped for mana, Plains produce
, Swamps produce
, Mountains produce
, and Forests produce
instead of any other type."