Damping Sphere 
Artifact
$0.67 #4998 1.12 8.4 years
If a land is tapped for two or more mana, it produces
instead of any other type and amount.
Each spell a player casts costs
more to cast for each other spell that player has cast this turn.
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Infernal Darkness88%
$6.73↑#18560↓1.29↑31.3 years↑
"If a land is tapped for mana, it produces
instead of any other type."
Contamination88%
$4.94↑#7916↓1.50↑27.9 years↑
"If a land is tapped for mana, it produces
instead of any other type and amount."
Ritual of Subdual86%
$1.45↑#26308↓1.1531.3 years↑
"If a land is tapped for mana, it produces colorless mana instead of any other type."
Rug of Smothering78%
$0.53↓#3849↑0.63↓4.2 years↓
"Whenever a player casts a spell, they lose 1 life for each spell they've cast this turn."
Pale Moon76%
$0.46↓#27758↓0.75↓26.6 years↑
"Until end of turn, if a player taps a nonbasic land for mana, it produces colorless mana instead of any other type."
Defense Grid74%
$6.62↑#1899↑1.27↑27.6 years↑
"Each spell costs
more to cast except during its controller's turn."
Hum of the Radix72%
$0.50↓#22723↓0.86↓22.9 years↑
"Each artifact spell costs
more to cast for each artifact its controller controls."
Eidolon of Rhetoric72%
$0.46↓#3456↑1.28↑12.3 years↑
"Each player can't cast more than one spell each turn."
Arcane Laboratory72%
$0.50↓#9704↓1.49↑27.9 years↑
"Each player can't cast more than one spell each turn."
Delightful Discovery71%
$0.26↓#15895↓0.21↓1.8 years↓
"This spell costs
less to cast for each spell your opponents have cast this turn."