Is Festering March legal in Standard, Modern, and Commander?

Festering March is legal in: Modern, Legacy, Vintage, Commander.

What type of card is Festering March?

Festering March is a Sorcery. Its oracle text reads: "Creatures your opponents control get -1/-1 until end of turn. Exile Festering March with three time counters on it. Suspend 3—{2}{B} (Rather than cast this card from your hand, you may pay {2}{B} and exile it with three time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.)"

Festering March

Sorcery

Creatures your opponents control get -1/-1 until end of turn. Exile Festering March with three time counters on it.

Suspend 3— (Rather than cast this card from your hand, you may pay and exile it with three time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.)