Is Marsh Gas legal in Standard, Modern, and Commander?

Marsh Gas is legal in: Legacy, Vintage, Commander, Pauper.

What type of card is Marsh Gas?

Marsh Gas is an Instant. Its oracle text reads: "All creatures get -2/-0 until end of turn."

Instant

All creatures get -2/-0 until end of turn.

Set The Dark

Rarity Common

Artist Douglas Shuler

Instant Commander Pauper Legacy