Isolation Cell 
Artifact
$0.29 #12718 0.50 15.4 years
Whenever an opponent casts a creature spell, that player loses 2 life unless they pay
.
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Cards similar to Isolation Cell expected a card that isn't here?
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"Whenever an opponent casts a spell, that player loses 5 life unless they discard a card."
Phyrexian Tyranny76%
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"Whenever a player draws a card, that player loses 2 life unless they pay
."
Mystic Remora76%
$10.47↑#101↑1.60↑31.4 years↑
"Whenever an opponent casts a noncreature spell, you may draw a card unless that player pays
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Spelltithe Enforcer76%
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"Whenever an opponent casts a spell, that player sacrifices a permanent of their choice unless they pay
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Chancellor of the Annex76%
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"Whenever an opponent casts a spell, counter it unless that player pays
."
Vectis Dominator74%
$0.10↓#29685↓0.13↓17.5 years↑
"
: Tap target creature unless its controller pays 2 life."
Aether Barrier72%
$6.20↑#145471.24↑26.7 years↑
"Whenever a player casts a creature spell, that player sacrifices a permanent of their choice unless they pay
."
Straw Golem71%
$0.15↓#30399↓0.00↓29.4 years↑
"When an opponent casts a creature spell, sacrifice this creature."
Nether Void70%
$673.40↑#16326↓2.18↑32.4 years↑
"Whenever a player casts a spell, counter it unless that player pays
."