Tainted Aether 
Enchantment
Whenever a creature enters, its controller sacrifices a creature or land of their choice.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL
Enchantment
Whenever a creature enters, its controller sacrifices a creature or land of their choice.