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

Marsh Casualties is legal in: Modern, Legacy, Vintage, Commander.

Marsh Casualties

Q: What type of card is Marsh Casualties?

Marsh Casualties is a Sorcery. Its oracle text reads: "Kicker {3} (You may pay an additional {3} as you cast this spell.) Creatures target player controls get -1/-1 until end of turn. If this spell was kicked, those creatures get -2/-2 until end of turn instead."