Damping Sphere 
Artifact
$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.
Each spell a player casts costs
more to cast for each other spell that player has cast this turn.
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Contamination82%
$4.97↑#7946↓1.69↑28.0 years↑
"If a land is tapped for mana, it produces
instead of any other type and amount."
Infernal Darkness82%
$6.56↑#18855↓1.4031.4 years↑
"If a land is tapped for mana, it produces
instead of any other type."
Ritual of Subdual80%
$1.41↑#26646↓1.3031.4 years↑
"If a land is tapped for mana, it produces colorless mana instead of any other type."
Rug of Smothering80%
$0.63↓#40000.57↓4.4 years↓
"Whenever a player casts a spell, they lose 1 life for each spell they've cast this turn."
Pale Moon77%
$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."
Defense Grid74%
$7.15↑#1923↑1.25↓27.7 years↑
"Each spell costs
more to cast except during its controller's turn."
Hum of the Radix73%
$0.47↓#22987↓0.89↓23.0 years↑
"Each artifact spell costs
more to cast for each artifact its controller controls."
Eidolon of Rhetoric73%
$0.55↓#3570↑1.56↑12.5 years↑
"Each player can't cast more than one spell each turn."
Arcane Laboratory73%
$0.52↓#9832↓1.68↑28.0 years↑
"Each player can't cast more than one spell each turn."
Delightful Discovery72%
$0.33↓#15839↓0.06↓1.9 years↓
"This spell costs
less to cast for each spell your opponents have cast this turn."