Aether Barrier 
Enchantment
Whenever a player casts a creature spell, that player sacrifices a permanent of their choice unless they pay 
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Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL
Enchantment
Whenever a player casts a creature spell, that player sacrifices a permanent of their choice unless they pay .