All creatures get -2/-0 until end of turn.
"Comes right outta th' ground. If ya can smell it, it's too late." —Keevy Bogsbury
Illustrated by Douglas Shuler · Fourth Edition · #146
There are no rulings for Marsh Gas.
All creatures get -1/-0 until end of turn.
All creatures get -1/-1 until end of turn.
Target creature gets -2/-2 until end of turn.
Target creature gets +2/-2 until end of turn.