Lethal Vapors 
Enchantment
Whenever a creature enters, destroy it.
: Destroy this enchantment. You skip your next turn. Any player may activate this ability.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL